25616440 has 16 divisors (see below), whose sum is σ = 57637080. Its totient is φ = 10246560.

The previous prime is 25616419. The next prime is 25616471. The reversal of 25616440 is 4461652.

It is a super-3 number, since 3×25616440³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25616399 and 25616408.

It is a congruent number.

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, 320166 + ... + 320245.

Almost surely, 2^25616440 is an apocalyptic number.

25616440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25616440 is an abundant number, since it is smaller than the sum of its proper divisors (32020640).

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

25616440 is a wasteful number, since it uses less digits than its factorization.

25616440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640422 (or 640418 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 25616440 is about 5061.2686156733. The cubic root of 25616440 is about 294.7855954305.

The spelling of 25616440 in words is "twenty-five million, six hundred sixteen thousand, four hundred forty".