25997480 has 16 divisors (see below), whose sum is σ = 58494420. Its totient is φ = 10398976.

The previous prime is 25997479. The next prime is 25997513. The reversal of 25997480 is 8479952.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25745476 + 252004 = 5074^2 + 502^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324929 + ... + 325008.

Almost surely, 2^25997480 is an apocalyptic number.

25997480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25997480 is an abundant number, since it is smaller than the sum of its proper divisors (32496940).

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

25997480 is a wasteful number, since it uses less digits than its factorization.

25997480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649948 (or 649944 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 25997480 is about 5098.7724012746. The cubic root of 25997480 is about 296.2400353904.

The spelling of 25997480 in words is "twenty-five million, nine hundred ninety-seven thousand, four hundred eighty".