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57000000 = 2635619

57000000 has 196 divisors, whose sum is σ = 198434960. Its totient is φ = 14400000.

The previous prime is 56999989. The next prime is 57000011. The reversal of 57000000 is 75.

Subtracting from 57000000 its product of nonzero digits (35), we obtain a palindrome (56999965).

Adding to 57000000 its reverse (75), we get a palindrome (57000075).

It is an interprime number because it is at equal distance from previous prime (56999989) and next prime (57000011).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 57000000.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2999991 + ... + 3000009.

Almost surely, 257000000 is an apocalyptic number.

57000000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99217480).

57000000 is an abundant number, since it is smaller than the sum of its proper divisors (141434960).

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

57000000 is an frugal number, since it uses more digits than its factorization.

57000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 35, while the sum is 12.

The square root of 57000000 is about 7549.8344352707. The cubic root of 57000000 is about 384.8501131277.

The spelling of 57000000 in words is "fifty-seven million", and thus it is an aban number and an uban number.