72678421817064 has 64 divisors (see below), whose sum is σ = 230725148630400. Its totient is φ = 20765263375872.

The previous prime is 72678421817063. The next prime is 72678421817077. The reversal of 72678421817064 is 46071812487627.

72678421817064 is a `hidden beast` number, since 7 + 2 + 6 + 7 + 8 + 421 + 81 + 70 + 64 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 72678421816992 and 72678421817010.

It is not an unprimeable number, because it can be changed into a prime (72678421817063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24033868137 + ... + 24033871160.

It is an arithmetic number, because the mean of its divisors is an integer number (3605080447350).

Almost surely, 2^{72678421817064} is an apocalyptic number.

It is an amenable number.

72678421817064 is an abundant number, since it is smaller than the sum of its proper divisors (158046726813336).

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

72678421817064 is a wasteful number, since it uses less digits than its factorization.

72678421817064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48067739319 (or 48067739309 counting only the distinct ones).

The product of its (nonzero) digits is 50577408, while the sum is 63.

The spelling of 72678421817064 in words is "seventy-two trillion, six hundred seventy-eight billion, four hundred twenty-one million, eight hundred seventeen thousand, sixty-four".