561264028 has 72 divisors (see below), whose sum is σ = 1155984480. Its totient is φ = 236718720.

The previous prime is 561264007. The next prime is 561264031. The reversal of 561264028 is 820462165.

It is a junction number, because it is equal to n+sod(n) for n = 561263984 and 561264002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 543873 + ... + 544903.

It is an arithmetic number, because the mean of its divisors is an integer number (16055340).

Almost surely, 2^561264028 is an apocalyptic number.

561264028 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

561264028 is an abundant number, since it is smaller than the sum of its proper divisors (594720452).

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

561264028 is a wasteful number, since it uses less digits than its factorization.

561264028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 561264028 is about 23691.0115444656. The cubic root of 561264028 is about 824.8767629816.

The spelling of 561264028 in words is "five hundred sixty-one million, two hundred sixty-four thousand, twenty-eight".