25919964 has 72 divisors (see below), whose sum is σ = 75959520. Its totient is φ = 7299072.

The previous prime is 25919953. The next prime is 25919969. The reversal of 25919964 is 46991952.

It is a super-2 number, since 2×25919964² = 1343689067522592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25919969) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17692 + ... + 19100.

Almost surely, 2^25919964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25919964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37979760).

25919964 is an abundant number, since it is smaller than the sum of its proper divisors (50039556).

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

25919964 is a wasteful number, since it uses less digits than its factorization.

25919964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1494 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 25919964 is about 5091.1652890080. The cubic root of 25919964 is about 295.9453119078.

The spelling of 25919964 in words is "twenty-five million, nine hundred nineteen thousand, nine hundred sixty-four".