561972390 has 64 divisors (see below), whose sum is σ = 1555614720. Its totient is φ = 127267200.

The previous prime is 561972379. The next prime is 561972401. The reversal of 561972390 is 93279165.

It is an interprime number because it is at equal distance from previous prime (561972379) and next prime (561972401).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10615 + ... + 35165.

It is an arithmetic number, because the mean of its divisors is an integer number (24306480).

Almost surely, 2^561972390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561972390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777807360).

561972390 is an abundant number, since it is smaller than the sum of its proper divisors (993642330).

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

561972390 is a wasteful number, since it uses less digits than its factorization.

561972390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24677.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 561972390 is about 23705.9568463287. The cubic root of 561972390 is about 825.2236381777.

The spelling of 561972390 in words is "five hundred sixty-one million, nine hundred seventy-two thousand, three hundred ninety".