55778859 has 6 divisors (see below), whose sum is σ = 80569476. Its totient is φ = 37185900.

The previous prime is 55778837. The next prime is 55778867. The reversal of 55778859 is 95887755.

55778859 is a `hidden beast` number, since 557 + 7 + 8 + 85 + 9 = 666.

It is not a de Polignac number, because 55778859 - 2⁷ = 55778731 is a prime.

It is a super-2 number, since 2×55778859² = 6222562222683762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55778759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3098817 + ... + 3098834.

It is an arithmetic number, because the mean of its divisors is an integer number (13428246).

Almost surely, 2^55778859 is an apocalyptic number.

55778859 is a deficient number, since it is larger than the sum of its proper divisors (24790617).

55778859 is a wasteful number, since it uses less digits than its factorization.

55778859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6197657 (or 6197654 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 54.

The square root of 55778859 is about 7468.5245530828. The cubic root of 55778859 is about 382.0819680102.

The spelling of 55778859 in words is "fifty-five million, seven hundred seventy-eight thousand, eight hundred fifty-nine".