72631559 has 16 divisors (see below), whose sum is σ = 97520640. Its totient is φ = 52241760.

The previous prime is 72631549. The next prime is 72631561. The reversal of 72631559 is 95513627.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72631559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72631519) 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, 35279 + ... + 37280.

It is an arithmetic number, because the mean of its divisors is an integer number (6095040).

Almost surely, 2^72631559 is an apocalyptic number.

72631559 is a deficient number, since it is larger than the sum of its proper divisors (24889081).

72631559 is a wasteful number, since it uses less digits than its factorization.

72631559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72590.

The product of its digits is 56700, while the sum is 38.

The square root of 72631559 is about 8522.4150919795. The cubic root of 72631559 is about 417.2296101424.

The spelling of 72631559 in words is "seventy-two million, six hundred thirty-one thousand, five hundred fifty-nine".