634545220 has 12 divisors (see below), whose sum is σ = 1332545004. Its totient is φ = 253818080.

The previous prime is 634545211. The next prime is 634545221. The reversal of 634545220 is 22545436.

It can be written as a sum of positive squares in 2 ways, for example, as 215032896 + 419512324 = 14664^2 + 20482^2 .

It is a super-3 number, since 3×634545220³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (634545221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15863611 + ... + 15863650.

It is an arithmetic number, because the mean of its divisors is an integer number (111045417).

Almost surely, 2^634545220 is an apocalyptic number.

It is an amenable number.

634545220 is an abundant number, since it is smaller than the sum of its proper divisors (697999784).

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

634545220 is a wasteful number, since it uses less digits than its factorization.

634545220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31727270 (or 31727268 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 634545220 is about 25190.1810235655. The cubic root of 634545220 is about 859.3185606042.

The spelling of 634545220 in words is "six hundred thirty-four million, five hundred forty-five thousand, two hundred twenty".