25375440 has 80 divisors (see below), whose sum is σ = 82101888. Its totient is φ = 6471168.

The previous prime is 25375429. The next prime is 25375477. The reversal of 25375440 is 4457352.

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 (30).

It is a junction number, because it is equal to n+sod(n) for n = 25375398 and 25375407.

It is a congruent number.

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, 3222 + ... + 7818.

Almost surely, 2^25375440 is an apocalyptic number.

25375440 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 25375440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41050944).

25375440 is an abundant number, since it is smaller than the sum of its proper divisors (56726448).

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

25375440 is a wasteful number, since it uses less digits than its factorization.

25375440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636 (or 4630 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 30.

The square root of 25375440 is about 5037.4040933798. The cubic root of 25375440 is about 293.8582314318.

The spelling of 25375440 in words is "twenty-five million, three hundred seventy-five thousand, four hundred forty".