57640291 has 4 divisors (see below), whose sum is σ = 57715632. Its totient is φ = 57564952.

The previous prime is 57640249. The next prime is 57640307. The reversal of 57640291 is 19204675.

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

It is a cyclic number.

It is not a de Polignac number, because 57640291 - 2²¹ = 55543139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57640201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36511 + ... + 38056.

It is an arithmetic number, because the mean of its divisors is an integer number (14428908).

Almost surely, 2^57640291 is an apocalyptic number.

57640291 is a deficient number, since it is larger than the sum of its proper divisors (75341).

57640291 is an equidigital number, since it uses as much as digits as its factorization.

57640291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75340.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 57640291 is about 7592.1203230718. The cubic root of 57640291 is about 386.2857803840.

The spelling of 57640291 in words is "fifty-seven million, six hundred forty thousand, two hundred ninety-one".