55638890 has 16 divisors (see below), whose sum is σ = 100251432. Its totient is φ = 22233024.

The previous prime is 55638883. The next prime is 55638911. The reversal of 55638890 is 9883655.

It can be written as a sum of positive squares in 4 ways, for example, as 55636681 + 2209 = 7459^2 + 47^2 .

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, 10592 + ... + 14948.

Almost surely, 2^55638890 is an apocalyptic number.

55638890 is a deficient number, since it is larger than the sum of its proper divisors (44612542).

55638890 is a wasteful number, since it uses less digits than its factorization.

55638890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5641.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 55638890 is about 7459.1480746798. The cubic root of 55638890 is about 381.7621071194.

The spelling of 55638890 in words is "fifty-five million, six hundred thirty-eight thousand, eight hundred ninety".