57661312 has 16 divisors (see below), whose sum is σ = 114872400. Its totient is φ = 28830592.

The previous prime is 57661283. The next prime is 57661319. The reversal of 57661312 is 21316675.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×57661312² = 6649653803122688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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 (57661319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225112 + ... + 225367.

It is an arithmetic number, because the mean of its divisors is an integer number (7179525).

Almost surely, 2^57661312 is an apocalyptic number.

It is an amenable number.

57661312 is a deficient number, since it is larger than the sum of its proper divisors (57211088).

57661312 is an equidigital number, since it uses as much as digits as its factorization.

57661312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450493 (or 450481 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 57661312 is about 7593.5045927424. The cubic root of 57661312 is about 386.3327332263.

Adding to 57661312 its reverse (21316675), we get a palindrome (78977987).

The spelling of 57661312 in words is "fifty-seven million, six hundred sixty-one thousand, three hundred twelve".