45891220 has 24 divisors (see below), whose sum is σ = 96781608. Its totient is φ = 18278400.

The previous prime is 45891217. The next prime is 45891227. The reversal of 45891220 is 2219854.

It can be written as a sum of positive squares in 4 ways, for example, as 7772944 + 38118276 = 2788^2 + 6174^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45891227) 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, 60 + ... + 9580.

It is an arithmetic number, because the mean of its divisors is an integer number (4032567).

It is a vampire number, since it can be written as 4820 ⋅ 9521 (with its own digits).

Almost surely, 2^45891220 is an apocalyptic number.

It is an amenable number.

45891220 is an abundant number, since it is smaller than the sum of its proper divisors (50890388).

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

45891220 is a wasteful number, since it uses less digits than its factorization.

45891220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9771 (or 9769 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 45891220 is about 6774.3058685005. The cubic root of 45891220 is about 358.0221265311.

The spelling of 45891220 in words is "forty-five million, eight hundred ninety-one thousand, two hundred twenty".