55505578 has 16 divisors (see below), whose sum is σ = 91990080. Its totient is φ = 24984256.

The previous prime is 55505557. The next prime is 55505581. The reversal of 55505578 is 87550555.

It is a super-2 number, since 2×55505578² = 6161738378228168, 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 55505578.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34708 + ... + 36271.

It is an arithmetic number, because the mean of its divisors is an integer number (5749380).

Almost surely, 2^55505578 is an apocalyptic number.

55505578 is a deficient number, since it is larger than the sum of its proper divisors (36484502).

55505578 is a wasteful number, since it uses less digits than its factorization.

55505578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71021.

The product of its (nonzero) digits is 175000, while the sum is 40.

The square root of 55505578 is about 7450.2065743173. The cubic root of 55505578 is about 381.4569598174.

The spelling of 55505578 in words is "fifty-five million, five hundred five thousand, five hundred seventy-eight".