18696072078 has 32 divisors (see below), whose sum is σ = 42560169120. Its totient is φ = 6080022720.

The previous prime is 18696072041. The next prime is 18696072107. The reversal of 18696072078 is 87027069681.

18696072078 is a `hidden beast` number, since 1 + 8 + 6 + 9 + 607 + 20 + 7 + 8 = 666.

It is a super-2 number, since 2×18696072078² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4220025 + ... + 4224452.

It is an arithmetic number, because the mean of its divisors is an integer number (1330005285).

Almost surely, 2^18696072078 is an apocalyptic number.

18696072078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18696072078 is an abundant number, since it is smaller than the sum of its proper divisors (23864097042).

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

18696072078 is a wasteful number, since it uses less digits than its factorization.

18696072078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8444529 (or 8444523 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 18696072078 in words is "eighteen billion, six hundred ninety-six million, seventy-two thousand, seventy-eight".