561003872 has 48 divisors (see below), whose sum is σ = 1297577232. Its totient is φ = 235384320.

The previous prime is 561003871. The next prime is 561003913. The reversal of 561003872 is 278300165.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561003871) 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, 56723 + ... + 65874.

It is an arithmetic number, because the mean of its divisors is an integer number (27032859).

Almost surely, 2^561003872 is an apocalyptic number.

561003872 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

561003872 is an abundant number, since it is smaller than the sum of its proper divisors (736573360).

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

561003872 is a wasteful number, since it uses less digits than its factorization.

561003872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122631 (or 122623 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 561003872 is about 23685.5203024971. The cubic root of 561003872 is about 824.7492948660.

The spelling of 561003872 in words is "five hundred sixty-one million, three thousand, eight hundred seventy-two".