25291816 has 32 divisors (see below), whose sum is σ = 52073280. Its totient is φ = 11420800.

The previous prime is 25291813. The next prime is 25291823. The reversal of 25291816 is 61819252.

It is not an unprimeable number, because it can be changed into a prime (25291813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13836 + ... + 15556.

It is an arithmetic number, because the mean of its divisors is an integer number (1627290).

Almost surely, 2^25291816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25291816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26036640).

25291816 is an abundant number, since it is smaller than the sum of its proper divisors (26781464).

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

25291816 is a wasteful number, since it uses less digits than its factorization.

25291816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905 (or 1901 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 25291816 is about 5029.0969368267. The cubic root of 25291816 is about 293.5350758645.

The spelling of 25291816 in words is "twenty-five million, two hundred ninety-one thousand, eight hundred sixteen".