25245840 has 80 divisors (see below), whose sum is σ = 80405568. Its totient is φ = 6547968.

The previous prime is 25245823. The next prime is 25245893. The reversal of 25245840 is 4854252.

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 = 25245798 and 25245807.

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, 7459 + ... + 10301.

Almost surely, 2^25245840 is an apocalyptic number.

25245840 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 25245840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40202784).

25245840 is an abundant number, since it is smaller than the sum of its proper divisors (55159728).

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

25245840 is a wasteful number, since it uses less digits than its factorization.

25245840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896 (or 2890 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 25245840 is about 5024.5238580387. The cubic root of 25245840 is about 293.3571032161.

The spelling of 25245840 in words is "twenty-five million, two hundred forty-five thousand, eight hundred forty".