45639990 has 128 divisors (see below), whose sum is σ = 134922240. Its totient is φ = 10977120.

The previous prime is 45639989. The next prime is 45640003. The reversal of 45639990 is 9993654.

It is a happy number.

45639990 is a `hidden beast` number, since 4 + 5 + 639 + 9 + 9 + 0 = 666.

45639990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 359307 + ... + 359433.

It is an arithmetic number, because the mean of its divisors is an integer number (1054080).

Almost surely, 2^45639990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45639990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67461120).

45639990 is an abundant number, since it is smaller than the sum of its proper divisors (89282250).

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

45639990 is a wasteful number, since it uses less digits than its factorization.

45639990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 45639990 is about 6755.7375615102. The cubic root of 45639990 is about 357.3676038346.

The spelling of 45639990 in words is "forty-five million, six hundred thirty-nine thousand, nine hundred ninety".