55720857 has 8 divisors (see below), whose sum is σ = 76691200. Its totient is φ = 35948880.

The previous prime is 55720843. The next prime is 55720879. The reversal of 55720857 is 75802755.

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

It is not a de Polignac number, because 55720857 - 2⁶ = 55720793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55720657) 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, 299482 + ... + 299667.

It is an arithmetic number, because the mean of its divisors is an integer number (9586400).

Almost surely, 2^55720857 is an apocalyptic number.

It is an amenable number.

55720857 is a deficient number, since it is larger than the sum of its proper divisors (20970343).

55720857 is a wasteful number, since it uses less digits than its factorization.

55720857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599183.

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 55720857 is about 7464.6404467998. The cubic root of 55720857 is about 381.9494852933.

The spelling of 55720857 in words is "fifty-five million, seven hundred twenty thousand, eight hundred fifty-seven".