25280779 has 16 divisors (see below), whose sum is σ = 27498240. Its totient is φ = 23184000.

The previous prime is 25280767. The next prime is 25280789. The reversal of 25280779 is 97708252.

It is a cyclic number.

It is not a de Polignac number, because 25280779 - 2²¹ = 23183627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25280789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54609 + ... + 55069.

It is an arithmetic number, because the mean of its divisors is an integer number (1718640).

Almost surely, 2^25280779 is an apocalyptic number.

25280779 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25280779 is a deficient number, since it is larger than the sum of its proper divisors (2217461).

25280779 is a wasteful number, since it uses less digits than its factorization.

25280779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 25280779 is about 5027.9995027844. Note that the first 3 decimals coincide. The cubic root of 25280779 is about 293.4923714312.

The spelling of 25280779 in words is "twenty-five million, two hundred eighty thousand, seven hundred seventy-nine".