72623531 has 4 divisors (see below), whose sum is σ = 72641712. Its totient is φ = 72605352.

The previous prime is 72623527. The next prime is 72623533. The reversal of 72623531 is 13532627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13532627 = 149 ⋅90823.

It is a cyclic number.

It is not a de Polignac number, because 72623531 - 2² = 72623527 is a prime.

It is a super-2 number, since 2×72623531² = 10548354509815922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72623494 and 72623503.

It is not an unprimeable number, because it can be changed into a prime (72623533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 12053.

It is an arithmetic number, because the mean of its divisors is an integer number (18160428).

Almost surely, 2^72623531 is an apocalyptic number.

72623531 is a deficient number, since it is larger than the sum of its proper divisors (18181).

72623531 is a wasteful number, since it uses less digits than its factorization.

72623531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18180.

The product of its digits is 7560, while the sum is 29.

The square root of 72623531 is about 8521.9440857119. The cubic root of 72623531 is about 417.2142373817.

The spelling of 72623531 in words is "seventy-two million, six hundred twenty-three thousand, five hundred thirty-one".