561723000 has 128 divisors (see below), whose sum is σ = 1769152320. Its totient is φ = 148377600.

The previous prime is 561722999. The next prime is 561723073. The reversal of 561723000 is 327165.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 338172 + ... + 339828.

Almost surely, 2^561723000 is an apocalyptic number.

561723000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561723000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884576160).

561723000 is an abundant number, since it is smaller than the sum of its proper divisors (1207429320).

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

561723000 is a wasteful number, since it uses less digits than its factorization.

561723000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1780 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 561723000 is about 23700.6961923063. The cubic root of 561723000 is about 825.1015485652.

The spelling of 561723000 in words is "five hundred sixty-one million, seven hundred twenty-three thousand".