18761785420 has 72 divisors (see below), whose sum is σ = 45874306800. Its totient is φ = 6426725760.

The previous prime is 18761785411. The next prime is 18761785421. The reversal of 18761785420 is 2458716781.

It is a super-2 number, since 2×18761785420² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (18761785421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1139406 + ... + 1155754.

It is an arithmetic number, because the mean of its divisors is an integer number (637143150).

Almost surely, 2^18761785420 is an apocalyptic number.

18761785420 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 18761785420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22937153400).

18761785420 is an abundant number, since it is smaller than the sum of its proper divisors (27112521380).

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

18761785420 is a wasteful number, since it uses less digits than its factorization.

18761785420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17543 (or 17534 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 49.

The spelling of 18761785420 in words is "eighteen billion, seven hundred sixty-one million, seven hundred eighty-five thousand, four hundred twenty".