72655566 has 16 divisors (see below), whose sum is σ = 145394688. Its totient is φ = 24204600.

The previous prime is 72655559. The next prime is 72655571. The reversal of 72655566 is 66555627.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18561 + ... + 22131.

It is an arithmetic number, because the mean of its divisors is an integer number (9087168).

Almost surely, 2^72655566 is an apocalyptic number.

72655566 is an abundant number, since it is smaller than the sum of its proper divisors (72739122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72655566 is a wasteful number, since it uses less digits than its factorization.

72655566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6967.

The product of its digits is 378000, while the sum is 42.

The square root of 72655566 is about 8523.8234378711. The cubic root of 72655566 is about 417.2755742201.

The spelling of 72655566 in words is "seventy-two million, six hundred fifty-five thousand, five hundred sixty-six".