57155890 has 32 divisors (see below), whose sum is σ = 112565376. Its totient is φ = 20722560.

The previous prime is 57155873. The next prime is 57155893. The reversal of 57155890 is 9855175.

57155890 = T₄₀ + T₄₁ + ... + T₆₉₉.

It is not an unprimeable number, because it can be changed into a prime (57155893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54814 + ... + 55846.

It is an arithmetic number, because the mean of its divisors is an integer number (3517668).

Almost surely, 2^57155890 is an apocalyptic number.

57155890 is a deficient number, since it is larger than the sum of its proper divisors (55409486).

57155890 is a wasteful number, since it uses less digits than its factorization.

57155890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 57155890 is about 7560.1514535094. The cubic root of 57155890 is about 385.2006375373.

The spelling of 57155890 in words is "fifty-seven million, one hundred fifty-five thousand, eight hundred ninety".