57401820 has 72 divisors (see below), whose sum is σ = 198997344. Its totient is φ = 13120128.

The previous prime is 57401819. The next prime is 57401821. The reversal of 57401820 is 2810475.

It is an interprime number because it is at equal distance from previous prime (57401819) and next prime (57401821).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57401821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21519 + ... + 24038.

It is an arithmetic number, because the mean of its divisors is an integer number (2763852).

Almost surely, 2^57401820 is an apocalyptic number.

It is an amenable number.

57401820 is an abundant number, since it is smaller than the sum of its proper divisors (141595524).

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

57401820 is a wasteful number, since it uses less digits than its factorization.

57401820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45579 (or 45574 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 57401820 is about 7576.3988807348. The cubic root of 57401820 is about 385.7523266420.

The spelling of 57401820 in words is "fifty-seven million, four hundred one thousand, eight hundred twenty".