72815475 has 24 divisors (see below), whose sum is σ = 121641520. Its totient is φ = 38430720.

The previous prime is 72815473. The next prime is 72815489. The reversal of 72815475 is 57451827.

It is not a de Polignac number, because 72815475 - 2¹ = 72815473 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72815473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2271 + ... + 12279.

Almost surely, 2^72815475 is an apocalyptic number.

72815475 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

72815475 is a deficient number, since it is larger than the sum of its proper divisors (48826045).

72815475 is a wasteful number, since it uses less digits than its factorization.

72815475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10119 (or 10114 counting only the distinct ones).

The product of its digits is 78400, while the sum is 39.

The square root of 72815475 is about 8533.1984038812. The cubic root of 72815475 is about 417.5814797885.

The spelling of 72815475 in words is "seventy-two million, eight hundred fifteen thousand, four hundred seventy-five".