18690678972 has 108 divisors (see below), whose sum is σ = 55098637776. Its totient is φ = 5326675200.

The previous prime is 18690678943. The next prime is 18690678983. The reversal of 18690678972 is 27987609681.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 694153 + ... + 720575.

It is an arithmetic number, because the mean of its divisors is an integer number (510172572).

Almost surely, 2^18690678972 is an apocalyptic number.

18690678972 is a gapful number since it is divisible by the number (12) 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 18690678972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27549318888).

18690678972 is an abundant number, since it is smaller than the sum of its proper divisors (36407958804).

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

18690678972 is a wasteful number, since it uses less digits than its factorization.

18690678972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26848 (or 26836 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 18690678972 in words is "eighteen billion, six hundred ninety million, six hundred seventy-eight thousand, nine hundred seventy-two".