561478780 has 24 divisors (see below), whose sum is σ = 1181470752. Its totient is φ = 224140992.

The previous prime is 561478769. The next prime is 561478781. The reversal of 561478780 is 87874165.

It is a self number, because there is not a number n which added to its sum of digits gives 561478780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561478781) 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, 17847 + ... + 37966.

It is an arithmetic number, because the mean of its divisors is an integer number (49227948).

Almost surely, 2^561478780 is an apocalyptic number.

It is an amenable number.

561478780 is an abundant number, since it is smaller than the sum of its proper divisors (619991972).

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

561478780 is a wasteful number, since it uses less digits than its factorization.

561478780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56325 (or 56323 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 561478780 is about 23695.5434628539. The cubic root of 561478780 is about 824.9819549160.

The spelling of 561478780 in words is "five hundred sixty-one million, four hundred seventy-eight thousand, seven hundred eighty".