55785917 has 8 divisors (see below), whose sum is σ = 61013952. Its totient is φ = 50584000.

The previous prime is 55785913. The next prime is 55785923. The reversal of 55785917 is 71958755.

It is a happy number.

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 55785917 - 2² = 55785913 is a prime.

It is a super-2 number, since 2×55785917² = 6224137071061778, 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 (55785911) 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, 1913 + ... + 10734.

It is an arithmetic number, because the mean of its divisors is an integer number (7626744).

Almost surely, 2^55785917 is an apocalyptic number.

It is an amenable number.

55785917 is a deficient number, since it is larger than the sum of its proper divisors (5228035).

55785917 is a wasteful number, since it uses less digits than its factorization.

55785917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13059.

The product of its digits is 441000, while the sum is 47.

The square root of 55785917 is about 7468.9970544913. The cubic root of 55785917 is about 382.0980829615.

The spelling of 55785917 in words is "fifty-five million, seven hundred eighty-five thousand, nine hundred seventeen".