45521220 has 24 divisors (see below), whose sum is σ = 127459584. Its totient is φ = 12138976.

The previous prime is 45521191. The next prime is 45521251. The reversal of 45521220 is 2212554.

It is a happy number.

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, 379284 + ... + 379403.

It is an arithmetic number, because the mean of its divisors is an integer number (5310816).

Almost surely, 2^45521220 is an apocalyptic number.

It is an amenable number.

45521220 is an abundant number, since it is smaller than the sum of its proper divisors (81938364).

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

45521220 is a wasteful number, since it uses less digits than its factorization.

45521220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758699 (or 758697 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 45521220 is about 6746.9415293153. The cubic root of 45521220 is about 357.0573392196.

Adding to 45521220 its reverse (2212554), we get a palindrome (47733774).

The spelling of 45521220 in words is "forty-five million, five hundred twenty-one thousand, two hundred twenty".