25521680 has 80 divisors (see below), whose sum is σ = 62995968. Its totient is φ = 9600000.

The previous prime is 25521679. The next prime is 25521701. The reversal of 25521680 is 8612552.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101555 + ... + 101805.

Almost surely, 2^25521680 is an apocalyptic number.

25521680 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 25521680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31497984).

25521680 is an abundant number, since it is smaller than the sum of its proper divisors (37474288).

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

25521680 is a wasteful number, since it uses less digits than its factorization.

25521680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 25521680 is about 5051.8986529819. The cubic root of 25521680 is about 294.4216572954.

The spelling of 25521680 in words is "twenty-five million, five hundred twenty-one thousand, six hundred eighty".