25780755 has 128 divisors (see below), whose sum is σ = 59222016. Its totient is φ = 9216000.

The previous prime is 25780709. The next prime is 25780763. The reversal of 25780755 is 55708752.

It is not a de Polignac number, because 25780755 - 2⁷ = 25780627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 255205 + ... + 255305.

It is an arithmetic number, because the mean of its divisors is an integer number (462672).

Almost surely, 2^25780755 is an apocalyptic number.

25780755 is an abundant number, since it is smaller than the sum of its proper divisors (33441261).

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

25780755 is a wasteful number, since it uses less digits than its factorization.

25780755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157.

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 25780755 is about 5077.4752584331. The cubic root of 25780755 is about 295.4145469396.

The spelling of 25780755 in words is "twenty-five million, seven hundred eighty thousand, seven hundred fifty-five".