2561705928 has 48 divisors (see below), whose sum is σ = 7346071980. Its totient is φ = 803672064.

The previous prime is 2561705897. The next prime is 2561705929. The reversal of 2561705928 is 8295071652.

2561705928 is a `hidden beast` number, since 2 + 5 + 617 + 0 + 5 + 9 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2469891204 + 91814724 = 49698^2 + 9582^2 .

It is not an unprimeable number, because it can be changed into a prime (2561705929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1045225 + ... + 1047672.

Almost surely, 2^2561705928 is an apocalyptic number.

It is an amenable number.

2561705928 is an abundant number, since it is smaller than the sum of its proper divisors (4784366052).

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

2561705928 is a wasteful number, since it uses less digits than its factorization.

2561705928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092926 (or 2092919 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 2561705928 is about 50613.2979364119. The cubic root of 2561705928 is about 1368.2845540209.

The spelling of 2561705928 in words is "two billion, five hundred sixty-one million, seven hundred five thousand, nine hundred twenty-eight".