55570781 has 8 divisors (see below), whose sum is σ = 65226240. Its totient is φ = 46344528.

The previous prime is 55570769. The next prime is 55570813. The reversal of 55570781 is 18707555.

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 55570781 - 2⁶ = 55570717 is a prime.

It is a super-2 number, since 2×55570781² = 6176223401899922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55570721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107021 + ... + 107538.

It is an arithmetic number, because the mean of its divisors is an integer number (8153280).

Almost surely, 2^55570781 is an apocalyptic number.

It is an amenable number.

55570781 is a deficient number, since it is larger than the sum of its proper divisors (9655459).

55570781 is a wasteful number, since it uses less digits than its factorization.

55570781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214603.

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 55570781 is about 7454.5812088943. The cubic root of 55570781 is about 381.6062685668.

The spelling of 55570781 in words is "fifty-five million, five hundred seventy thousand, seven hundred eighty-one".