57440661 has 4 divisors (see below), whose sum is σ = 76587552. Its totient is φ = 38293772.

The previous prime is 57440657. The next prime is 57440699. The reversal of 57440661 is 16604475.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57440661 - 2² = 57440657 is a prime.

It is a super-2 number, since 2×57440661² = 6598859072233842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57440611) 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, 9573441 + ... + 9573446.

It is an arithmetic number, because the mean of its divisors is an integer number (19146888).

Almost surely, 2^57440661 is an apocalyptic number.

It is an amenable number.

57440661 is a deficient number, since it is larger than the sum of its proper divisors (19146891).

57440661 is a wasteful number, since it uses less digits than its factorization.

57440661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19146890.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 57440661 is about 7578.9617362802. The cubic root of 57440661 is about 385.8393135933.

The spelling of 57440661 in words is "fifty-seven million, four hundred forty thousand, six hundred sixty-one".