25242840 has 288 divisors, whose sum is σ = 100835280. Its totient is φ = 5660928.

The previous prime is 25242827. The next prime is 25242857. The reversal of 25242840 is 4824252.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 476254 + ... + 476306.

Almost surely, 2^25242840 is an apocalyptic number.

25242840 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 25242840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50417640).

25242840 is an abundant number, since it is smaller than the sum of its proper divisors (75592440).

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

25242840 is a wasteful number, since it uses less digits than its factorization.

25242840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 25242840 is about 5024.2253134190. The cubic root of 25242840 is about 293.3454827383.

The spelling of 25242840 in words is "twenty-five million, two hundred forty-two thousand, eight hundred forty".