72653531 has 4 divisors (see below), whose sum is σ = 74343192. Its totient is φ = 70963872.

The previous prime is 72653521. The next prime is 72653561. The reversal of 72653531 is 13535627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13535627 = 7 ⋅1933661.

It is a cyclic number.

It is not a de Polignac number, because 72653531 - 2⁶ = 72653467 is a prime.

It is a super-2 number, since 2×72653531² = 10557071133535922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72653521) 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, 844766 + ... + 844851.

It is an arithmetic number, because the mean of its divisors is an integer number (18585798).

Almost surely, 2^72653531 is an apocalyptic number.

72653531 is a deficient number, since it is larger than the sum of its proper divisors (1689661).

72653531 is a wasteful number, since it uses less digits than its factorization.

72653531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689660.

The product of its digits is 18900, while the sum is 32.

The square root of 72653531 is about 8523.7040657217. The cubic root of 72653531 is about 417.2716783786.

The spelling of 72653531 in words is "seventy-two million, six hundred fifty-three thousand, five hundred thirty-one".