57216609 has 12 divisors (see below), whose sum is σ = 83174676. Its totient is φ = 37900512.

The previous prime is 57216589. The next prime is 57216613. The reversal of 57216609 is 90661275.

It can be written as a sum of positive squares in 2 ways, for example, as 10595025 + 46621584 = 3255^2 + 6828^2 .

It is not a de Polignac number, because 57216609 - 2¹² = 57212513 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57216629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18834 + ... + 21659.

It is an arithmetic number, because the mean of its divisors is an integer number (6931223).

Almost surely, 2^57216609 is an apocalyptic number.

It is an amenable number.

57216609 is a deficient number, since it is larger than the sum of its proper divisors (25958067).

57216609 is a wasteful number, since it uses less digits than its factorization.

57216609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40656 (or 40653 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 57216609 is about 7564.1661139877. The cubic root of 57216609 is about 385.3369939714.

The spelling of 57216609 in words is "fifty-seven million, two hundred sixteen thousand, six hundred nine".