25977989 has 8 divisors (see below), whose sum is σ = 27630360. Its totient is φ = 24339456.

The previous prime is 25977979. The next prime is 25978013. The reversal of 25977989 is 98977952.

It can be written as a sum of positive squares in 4 ways, for example, as 6041764 + 19936225 = 2458^2 + 4465^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25977989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25977929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557 + ... + 7229.

It is an arithmetic number, because the mean of its divisors is an integer number (3453795).

Almost surely, 2^25977989 is an apocalyptic number.

It is an amenable number.

25977989 is a deficient number, since it is larger than the sum of its proper divisors (1652371).

25977989 is a wasteful number, since it uses less digits than its factorization.

25977989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6919.

The product of its digits is 2857680, while the sum is 56.

The square root of 25977989 is about 5096.8607004704. The cubic root of 25977989 is about 296.1659838783.

The spelling of 25977989 in words is "twenty-five million, nine hundred seventy-seven thousand, nine hundred eighty-nine".