57491616 has 96 divisors (see below), whose sum is σ = 185770368. Its totient is φ = 15160320.

The previous prime is 57491563. The next prime is 57491617. The reversal of 57491616 is 61619475.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (57491617) 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, 5446 + ... + 12026.

It is an arithmetic number, because the mean of its divisors is an integer number (1935108).

Almost surely, 2^57491616 is an apocalyptic number.

57491616 is a gapful number since it is divisible by the number (56) 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 57491616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92885184).

57491616 is an abundant number, since it is smaller than the sum of its proper divisors (128278752).

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

57491616 is a wasteful number, since it uses less digits than its factorization.

57491616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6614 (or 6606 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 57491616 is about 7582.3225993095. The cubic root of 57491616 is about 385.9533711919.

The spelling of 57491616 in words is "fifty-seven million, four hundred ninety-one thousand, six hundred sixteen".