55807657 has 8 divisors (see below), whose sum is σ = 57699072. Its totient is φ = 53922000.

The previous prime is 55807639. The next prime is 55807699. The reversal of 55807657 is 75670855.

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

It is a cyclic number.

It is not a de Polignac number, because 55807657 - 2¹¹ = 55805609 is a prime.

It is a super-2 number, since 2×55807657² = 6228989159659298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55807607) 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, 28407 + ... + 30307.

It is an arithmetic number, because the mean of its divisors is an integer number (7212384).

Almost surely, 2^55807657 is an apocalyptic number.

It is an amenable number.

55807657 is a deficient number, since it is larger than the sum of its proper divisors (1891415).

55807657 is a wasteful number, since it uses less digits than its factorization.

55807657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879.

The product of its (nonzero) digits is 294000, while the sum is 43.

The square root of 55807657 is about 7470.4522620789. The cubic root of 55807657 is about 382.1477115771.

The spelling of 55807657 in words is "fifty-five million, eight hundred seven thousand, six hundred fifty-seven".