25779489 has 16 divisors (see below), whose sum is σ = 35335872. Its totient is φ = 16708608.

The previous prime is 25779487. The next prime is 25779511. The reversal of 25779489 is 98497752.

It is not a de Polignac number, because 25779489 - 2¹ = 25779487 is a prime.

It is a super-2 number, since 2×25779489² = 1329164106202242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25779487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43177 + ... + 43769.

It is an arithmetic number, because the mean of its divisors is an integer number (2208492).

Almost surely, 2^25779489 is an apocalyptic number.

It is an amenable number.

25779489 is a deficient number, since it is larger than the sum of its proper divisors (9556383).

25779489 is a wasteful number, since it uses less digits than its factorization.

25779489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its digits is 1270080, while the sum is 51.

The square root of 25779489 is about 5077.3505886436. The cubic root of 25779489 is about 295.4097112790.

The spelling of 25779489 in words is "twenty-five million, seven hundred seventy-nine thousand, four hundred eighty-nine".