57491765 has 4 divisors (see below), whose sum is σ = 68990124. Its totient is φ = 45993408.

The previous prime is 57491761. The next prime is 57491767. The reversal of 57491765 is 56719475.

57491765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 36276529 = 4606^2 + 6023^2 .

It is a cyclic number.

It is not a de Polignac number, because 57491765 - 2² = 57491761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57491761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5749172 + ... + 5749181.

It is an arithmetic number, because the mean of its divisors is an integer number (17247531).

Almost surely, 2^57491765 is an apocalyptic number.

It is an amenable number.

57491765 is a deficient number, since it is larger than the sum of its proper divisors (11498359).

57491765 is a wasteful number, since it uses less digits than its factorization.

57491765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11498358.

The product of its digits is 264600, while the sum is 44.

The square root of 57491765 is about 7582.3324247886. The cubic root of 57491765 is about 385.9537046144.

The spelling of 57491765 in words is "fifty-seven million, four hundred ninety-one thousand, seven hundred sixty-five".