25579664 has 40 divisors (see below), whose sum is σ = 54639360. Its totient is φ = 11504000.

The previous prime is 25579639. The next prime is 25579669. The reversal of 25579664 is 46697552.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (25579669) 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, 17057 + ... + 18495.

It is an arithmetic number, because the mean of its divisors is an integer number (1365984).

Almost surely, 2^25579664 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 25579664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27319680).

25579664 is an abundant number, since it is smaller than the sum of its proper divisors (29059696).

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

25579664 is a wasteful number, since it uses less digits than its factorization.

25579664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559 (or 1553 counting only the distinct ones).

The product of its digits is 453600, while the sum is 44.

The square root of 25579664 is about 5057.6342295583. The cubic root of 25579664 is about 294.6444591505.

It can be divided in two parts, 2557 and 9664, that added together give a palindrome (12221).

The spelling of 25579664 in words is "twenty-five million, five hundred seventy-nine thousand, six hundred sixty-four".