55779558 has 8 divisors (see below), whose sum is σ = 111559128. Its totient is φ = 18593184.

The previous prime is 55779541. The next prime is 55779599. The reversal of 55779558 is 85597755.

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

55779558 is an admirable number.

It is a super-2 number, since 2×55779558² = 6222718181350728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55779558.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4648291 + ... + 4648302.

It is an arithmetic number, because the mean of its divisors is an integer number (13944891).

Almost surely, 2^55779558 is an apocalyptic number.

55779558 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55779558 is a wasteful number, since it uses less digits than its factorization.

55779558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9296598.

The product of its digits is 2205000, while the sum is 51.

The square root of 55779558 is about 7468.5713493278. The cubic root of 55779558 is about 382.0835640401.

The spelling of 55779558 in words is "fifty-five million, seven hundred seventy-nine thousand, five hundred fifty-eight".