57128890 has 64 divisors (see below), whose sum is σ = 128588544. Its totient is φ = 17791488.

The previous prime is 57128881. The next prime is 57128899. The reversal of 57128890 is 9882175.

It is an interprime number because it is at equal distance from previous prime (57128881) and next prime (57128899).

It is not an unprimeable number, because it can be changed into a prime (57128899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60502 + ... + 61438.

It is an arithmetic number, because the mean of its divisors is an integer number (2009196).

Almost surely, 2^57128890 is an apocalyptic number.

57128890 is an abundant number, since it is smaller than the sum of its proper divisors (71459654).

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

57128890 is a wasteful number, since it uses less digits than its factorization.

57128890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 57128890 is about 7558.3655640621. The cubic root of 57128890 is about 385.1399727173.

The spelling of 57128890 in words is "fifty-seven million, one hundred twenty-eight thousand, eight hundred ninety".