57216445 has 32 divisors (see below), whose sum is σ = 82583424. Its totient is φ = 37497600.

The previous prime is 57216413. The next prime is 57216457. The reversal of 57216445 is 54461275.

It is not a de Polignac number, because 57216445 - 2⁵ = 57216413 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 57216445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29815 + ... + 31675.

It is an arithmetic number, because the mean of its divisors is an integer number (2580732).

Almost surely, 2^57216445 is an apocalyptic number.

57216445 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

57216445 is a deficient number, since it is larger than the sum of its proper divisors (25366979).

57216445 is a wasteful number, since it uses less digits than its factorization.

57216445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its digits is 33600, while the sum is 34.

The square root of 57216445 is about 7564.1552733931. The cubic root of 57216445 is about 385.3366258072.

The spelling of 57216445 in words is "fifty-seven million, two hundred sixteen thousand, four hundred forty-five".