25009779 has 4 divisors (see below), whose sum is σ = 33346376. Its totient is φ = 16673184.

The previous prime is 25009759. The next prime is 25009783. The reversal of 25009779 is 97790052.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25009779 - 2⁷ = 25009651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25009759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4168294 + ... + 4168299.

It is an arithmetic number, because the mean of its divisors is an integer number (8336594).

Almost surely, 2^25009779 is an apocalyptic number.

25009779 is a deficient number, since it is larger than the sum of its proper divisors (8336597).

25009779 is an equidigital number, since it uses as much as digits as its factorization.

25009779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8336596.

The product of its (nonzero) digits is 39690, while the sum is 39.

The square root of 25009779 is about 5000.9778043899. The cubic root of 25009779 is about 292.4398941440.

The spelling of 25009779 in words is "twenty-five million, nine thousand, seven hundred seventy-nine".