72578432623 has 16 divisors (see below), whose sum is σ = 74649168000. Its totient is φ = 70543579392.

The previous prime is 72578432611. The next prime is 72578432629. The reversal of 72578432623 is 32623487527.

It is a cyclic number.

It is not a de Polignac number, because 72578432623 - 2⁹ = 72578432111 is a prime.

It is a super-2 number, since 2×72578432623² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72578432629) 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, 1587561 + ... + 1632637.

It is an arithmetic number, because the mean of its divisors is an integer number (4665573000).

Almost surely, 2^72578432623 is an apocalyptic number.

72578432623 is a deficient number, since it is larger than the sum of its proper divisors (2070735377).

72578432623 is a wasteful number, since it uses less digits than its factorization.

72578432623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45474.

The product of its digits is 3386880, while the sum is 49.

The spelling of 72578432623 in words is "seventy-two billion, five hundred seventy-eight million, four hundred thirty-two thousand, six hundred twenty-three".