55005990 has 32 divisors (see below), whose sum is σ = 142170336. Its totient is φ = 13539840.

The previous prime is 55005971. The next prime is 55005991. The reversal of 55005990 is 9950055.

55005990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55005991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70131 + ... + 70910.

It is an arithmetic number, because the mean of its divisors is an integer number (4442823).

Almost surely, 2^55005990 is an apocalyptic number.

55005990 is an abundant number, since it is smaller than the sum of its proper divisors (87164346).

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

55005990 is a wasteful number, since it uses less digits than its factorization.

55005990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141064.

The product of its (nonzero) digits is 10125, while the sum is 33.

The square root of 55005990 is about 7416.6023218183. The cubic root of 55005990 is about 380.3090514448.

The spelling of 55005990 in words is "fifty-five million, five thousand, nine hundred ninety".