55099920 has 40 divisors (see below), whose sum is σ = 170810496. Its totient is φ = 14693248.

The previous prime is 55099903. The next prime is 55099921. The reversal of 55099920 is 2999055.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (55099921) 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, 114552 + ... + 115031.

Almost surely, 2^55099920 is an apocalyptic number.

It is an amenable number.

55099920 is an abundant number, since it is smaller than the sum of its proper divisors (115710576).

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

55099920 is a wasteful number, since it uses less digits than its factorization.

55099920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229599 (or 229593 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 39.

The square root of 55099920 is about 7422.9320352540. The cubic root of 55099920 is about 380.5254043358.

The spelling of 55099920 in words is "fifty-five million, ninety-nine thousand, nine hundred twenty".