45639820 has 48 divisors (see below), whose sum is σ = 102187008. Its totient is φ = 17082560.

The previous prime is 45639817. The next prime is 45639821. The reversal of 45639820 is 2893654.

It is a self number, because there is not a number n which added to its sum of digits gives 45639820.

It is not an unprimeable number, because it can be changed into a prime (45639821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20565 + ... + 22675.

It is an arithmetic number, because the mean of its divisors is an integer number (2128896).

Almost surely, 2^45639820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45639820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51093504).

45639820 is an abundant number, since it is smaller than the sum of its proper divisors (56547188).

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

45639820 is a wasteful number, since it uses less digits than its factorization.

45639820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 2188 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 45639820 is about 6755.7249796006. The cubic root of 45639820 is about 357.3671601260.

The spelling of 45639820 in words is "forty-five million, six hundred thirty-nine thousand, eight hundred twenty".