25249280 has 80 divisors (see below), whose sum is σ = 69236640. Its totient is φ = 8650752.

The previous prime is 25249261. The next prime is 25249297. The reversal of 25249280 is 8294252.

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

It is a super-2 number, since 2×25249280² = 1275052281036800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17216 + ... + 18624.

It is an arithmetic number, because the mean of its divisors is an integer number (865458).

Almost surely, 2^25249280 is an apocalyptic number.

25249280 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 25249280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34618320).

25249280 is an abundant number, since it is smaller than the sum of its proper divisors (43987360).

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

25249280 is an equidigital number, since it uses as much as digits as its factorization.

25249280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439 (or 1423 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 25249280 is about 5024.8661673720. The cubic root of 25249280 is about 293.3704268977.

The spelling of 25249280 in words is "twenty-five million, two hundred forty-nine thousand, two hundred eighty".