55657509 has 8 divisors (see below), whose sum is σ = 76215840. Its totient is φ = 36102096.

The previous prime is 55657501. The next prime is 55657513. The reversal of 55657509 is 90575655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55657509 - 2³ = 55657501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55657501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250599 + ... + 250820.

It is an arithmetic number, because the mean of its divisors is an integer number (9526980).

Almost surely, 2^55657509 is an apocalyptic number.

It is an amenable number.

55657509 is a deficient number, since it is larger than the sum of its proper divisors (20558331).

55657509 is a wasteful number, since it uses less digits than its factorization.

55657509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501459.

The product of its (nonzero) digits is 236250, while the sum is 42.

The square root of 55657509 is about 7460.3960350641. The cubic root of 55657509 is about 381.8046866649.

The spelling of 55657509 in words is "fifty-five million, six hundred fifty-seven thousand, five hundred nine".