57121284 has 24 divisors (see below), whose sum is σ = 145399968. Its totient is φ = 17309440.

The previous prime is 57121283. The next prime is 57121289. The reversal of 57121284 is 48212175.

It is not an unprimeable number, because it can be changed into a prime (57121283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216237 + ... + 216500.

It is an arithmetic number, because the mean of its divisors is an integer number (6058332).

Almost surely, 2^57121284 is an apocalyptic number.

It is an amenable number.

57121284 is an abundant number, since it is smaller than the sum of its proper divisors (88278684).

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

57121284 is a wasteful number, since it uses less digits than its factorization.

57121284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432755 (or 432753 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 57121284 is about 7557.8623962070. The cubic root of 57121284 is about 385.1228797623.

It can be divided in two parts, 5712 and 1284, that added together give a palindrome (6996).

The spelling of 57121284 in words is "fifty-seven million, one hundred twenty-one thousand, two hundred eighty-four".