561672500 has 30 divisors (see below), whose sum is σ = 1228270890. Its totient is φ = 224668000.

The previous prime is 561672499. The next prime is 561672511. The reversal of 561672500 is 5276165.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 327827236 + 233845264 = 18106^2 + 15292^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 109835 + ... + 114834.

It is an arithmetic number, because the mean of its divisors is an integer number (40942363).

Almost surely, 2^561672500 is an apocalyptic number.

561672500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561672500 is an abundant number, since it is smaller than the sum of its proper divisors (666598390).

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

561672500 is a wasteful number, since it uses less digits than its factorization.

561672500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224693 (or 224676 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 561672500 is about 23699.6307988120. The cubic root of 561672500 is about 825.0768217414.

The spelling of 561672500 in words is "five hundred sixty-one million, six hundred seventy-two thousand, five hundred".