1878686460 has 432 divisors, whose sum is σ = 7194410496. Its totient is φ = 410743872.

The previous prime is 1878686449. The next prime is 1878686471. The reversal of 1878686460 is 646868781.

It is an interprime number because it is at equal distance from previous prime (1878686449) and next prime (1878686471).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1878686397 and 1878686406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 81682009 + ... + 81682031.

It is an arithmetic number, because the mean of its divisors is an integer number (16653728).

Almost surely, 2^1878686460 is an apocalyptic number.

1878686460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1878686460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3597205248).

1878686460 is an abundant number, since it is smaller than the sum of its proper divisors (5315724036).

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

1878686460 is an frugal number, since it uses more digits than its factorization.

1878686460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 1878686460 is about 43343.8168600782. The cubic root of 1878686460 is about 1233.9136496364.

The spelling of 1878686460 in words is "one billion, eight hundred seventy-eight million, six hundred eighty-six thousand, four hundred sixty".