72661475 has 6 divisors (see below), whose sum is σ = 90100260. Its totient is φ = 58129160.

The previous prime is 72661447. The next prime is 72661481. The reversal of 72661475 is 57416627.

It is not a de Polignac number, because 72661475 - 2⁶ = 72661411 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1453205 + ... + 1453254.

It is an arithmetic number, because the mean of its divisors is an integer number (15016710).

Almost surely, 2^72661475 is an apocalyptic number.

72661475 is a deficient number, since it is larger than the sum of its proper divisors (17438785).

72661475 is a wasteful number, since it uses less digits than its factorization.

72661475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906469 (or 2906464 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 72661475 is about 8524.1700475765. The cubic root of 72661475 is about 417.2868861065.

The spelling of 72661475 in words is "seventy-two million, six hundred sixty-one thousand, four hundred seventy-five".