45781220 has 24 divisors (see below), whose sum is σ = 97460664. Its totient is φ = 18061056.

The previous prime is 45781217. The next prime is 45781249. The reversal of 45781220 is 2218754.

It can be written as a sum of positive squares in 4 ways, for example, as 9972964 + 35808256 = 3158^2 + 5984^2 .

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, 14219 + ... + 17138.

It is an arithmetic number, because the mean of its divisors is an integer number (4060861).

Almost surely, 2^45781220 is an apocalyptic number.

It is an amenable number.

45781220 is an abundant number, since it is smaller than the sum of its proper divisors (51679444).

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

45781220 is a wasteful number, since it uses less digits than its factorization.

45781220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31439 (or 31437 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 45781220 is about 6766.1820844550. The cubic root of 45781220 is about 357.7358412526.

Adding to 45781220 its reverse (2218754), we get a palindrome (47999974).

The spelling of 45781220 in words is "forty-five million, seven hundred eighty-one thousand, two hundred twenty".