18870872408478 has 128 divisors (see below), whose sum is σ = 43049005608960. Its totient is φ = 6202037087424.

The previous prime is 18870872408473. The next prime is 18870872408483. The reversal of 18870872408478 is 87480427807881.

18870872408478 is a `hidden beast` number, since 1 + 8 + 8 + 70 + 87 + 2 + 4 + 0 + 8 + 478 = 666.

It is an interprime number because it is at equal distance from previous prime (18870872408473) and next prime (18870872408483).

It is a super-2 number, since 2×18870872408478² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870872408473) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1163209075 + ... + 1163225297.

It is an arithmetic number, because the mean of its divisors is an integer number (336320356320).

Almost surely, 2^{18870872408478} is an apocalyptic number.

18870872408478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18870872408478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21524502804480).

18870872408478 is an abundant number, since it is smaller than the sum of its proper divisors (24178133200482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18870872408478 is an equidigital number, since it uses as much as digits as its factorization.

18870872408478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19962 (or 19944 counting only the distinct ones).

The product of its (nonzero) digits is 359661568, while the sum is 72.

The spelling of 18870872408478 in words is "eighteen trillion, eight hundred seventy billion, eight hundred seventy-two million, four hundred eight thousand, four hundred seventy-eight".