561477672 has 144 divisors (see below), whose sum is σ = 1798629300. Its totient is φ = 157731840.

The previous prime is 561477589. The next prime is 561477731. The reversal of 561477672 is 276774165.

It can be written as a sum of positive squares in 2 ways, for example, as 508682916 + 52794756 = 22554^2 + 7266^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 213904 + ... + 216512.

Almost surely, 2^561477672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561477672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899314650).

561477672 is an abundant number, since it is smaller than the sum of its proper divisors (1237151628).

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

561477672 is a wasteful number, since it uses less digits than its factorization.

561477672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696 (or 2682 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 561477672 is about 23695.5200829186. The cubic root of 561477672 is about 824.9814122534.

The spelling of 561477672 in words is "five hundred sixty-one million, four hundred seventy-seven thousand, six hundred seventy-two".