25720775 has 24 divisors (see below), whose sum is σ = 33874320. Its totient is φ = 19319040.

The previous prime is 25720771. The next prime is 25720777. The reversal of 25720775 is 57702752.

It is not a de Polignac number, because 25720775 - 2² = 25720771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25720771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82019 + ... + 82331.

It is an arithmetic number, because the mean of its divisors is an integer number (1411430).

Almost surely, 2^25720775 is an apocalyptic number.

25720775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25720775 is a deficient number, since it is larger than the sum of its proper divisors (8153545).

25720775 is a wasteful number, since it uses less digits than its factorization.

25720775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 35.

The square root of 25720775 is about 5071.5653402081. The cubic root of 25720775 is about 295.1852709594.

The spelling of 25720775 in words is "twenty-five million, seven hundred twenty thousand, seven hundred seventy-five".