56657749 has 4 divisors (see below), whose sum is σ = 56859660. Its totient is φ = 56455840.

The previous prime is 56657743. The next prime is 56657761. The reversal of 56657749 is 94775665.

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 22259524 + 34398225 = 4718^2 + 5865^2 .

It is a cyclic number.

It is not a de Polignac number, because 56657749 - 2¹⁷ = 56526677 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 (56657743) 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, 100534 + ... + 101095.

It is an arithmetic number, because the mean of its divisors is an integer number (14214915).

Almost surely, 2^56657749 is an apocalyptic number.

It is an amenable number.

56657749 is a deficient number, since it is larger than the sum of its proper divisors (201911).

56657749 is a wasteful number, since it uses less digits than its factorization.

56657749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201910.

The product of its digits is 1587600, while the sum is 49.

The square root of 56657749 is about 7527.1341824097. The cubic root of 56657749 is about 384.0783011803.

The spelling of 56657749 in words is "fifty-six million, six hundred fifty-seven thousand, seven hundred forty-nine".