561797250 has 96 divisors (see below), whose sum is σ = 1631290752. Its totient is φ = 128402400.

The previous prime is 561797237. The next prime is 561797261. The reversal of 561797250 is 52797165.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29107 + ... + 44393.

It is an arithmetic number, because the mean of its divisors is an integer number (16992612).

Almost surely, 2^561797250 is an apocalyptic number.

561797250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 561797250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815645376).

561797250 is an abundant number, since it is smaller than the sum of its proper divisors (1069493502).

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

561797250 is a wasteful number, since it uses less digits than its factorization.

561797250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15321 (or 15304 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 42.

The square root of 561797250 is about 23702.2625502293. The cubic root of 561797250 is about 825.1379016495.

The spelling of 561797250 in words is "five hundred sixty-one million, seven hundred ninety-seven thousand, two hundred fifty".