25479440 has 80 divisors (see below), whose sum is σ = 68352768. Its totient is φ = 8652288.

The previous prime is 25479383. The next prime is 25479449. The reversal of 25479440 is 4497452.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 25479440.

It is not an unprimeable number, because it can be changed into a prime (25479449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96749 + ... + 97011.

Almost surely, 2^25479440 is an apocalyptic number.

25479440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25479440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34176384).

25479440 is an abundant number, since it is smaller than the sum of its proper divisors (42873328).

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

25479440 is a wasteful number, since it uses less digits than its factorization.

25479440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 25479440 is about 5047.7163153252. The cubic root of 25479440 is about 294.2591387606.

The spelling of 25479440 in words is "twenty-five million, four hundred seventy-nine thousand, four hundred forty".