57009381 has 32 divisors (see below), whose sum is σ = 94566528. Its totient is φ = 30013440.

The previous prime is 57009377. The next prime is 57009391. The reversal of 57009381 is 18390075.

It is not a de Polignac number, because 57009381 - 2² = 57009377 is a prime.

It is a super-2 number, since 2×57009381² = 6500139044006322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57009301) 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, 3385 + ... + 11201.

It is an arithmetic number, because the mean of its divisors is an integer number (2955204).

Almost surely, 2^57009381 is an apocalyptic number.

57009381 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

57009381 is a deficient number, since it is larger than the sum of its proper divisors (37557147).

57009381 is a wasteful number, since it uses less digits than its factorization.

57009381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7861.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 57009381 is about 7550.4556816129. The cubic root of 57009381 is about 384.8712247117.

The spelling of 57009381 in words is "fifty-seven million, nine thousand, three hundred eighty-one".