57228231 has 4 divisors (see below), whose sum is σ = 76304312. Its totient is φ = 38152152.

The previous prime is 57228173. The next prime is 57228253. The reversal of 57228231 is 13282275.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 57228231 - 2⁹ = 57227719 is a prime.

It is a super-2 number, since 2×57228231² = 6550140846778722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57228331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9538036 + ... + 9538041.

It is an arithmetic number, because the mean of its divisors is an integer number (19076078).

Almost surely, 2^57228231 is an apocalyptic number.

57228231 is a deficient number, since it is larger than the sum of its proper divisors (19076081).

57228231 is a wasteful number, since it uses less digits than its factorization.

57228231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19076080.

The product of its digits is 6720, while the sum is 30.

The square root of 57228231 is about 7564.9343024246. The cubic root of 57228231 is about 385.3630824530.

The spelling of 57228231 in words is "fifty-seven million, two hundred twenty-eight thousand, two hundred thirty-one".