25278825 has 48 divisors (see below), whose sum is σ = 49121856. Its totient is φ = 11308800.

The previous prime is 25278821. The next prime is 25278833. The reversal of 25278825 is 52887252.

It is a happy number.

It is not a de Polignac number, because 25278825 - 2² = 25278821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (25278821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9547 + ... + 11903.

It is an arithmetic number, because the mean of its divisors is an integer number (1023372).

Almost surely, 2^25278825 is an apocalyptic number.

25278825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25278825 is a deficient number, since it is larger than the sum of its proper divisors (23843031).

25278825 is a wasteful number, since it uses less digits than its factorization.

25278825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394 (or 2389 counting only the distinct ones).

The product of its digits is 89600, while the sum is 39.

The square root of 25278825 is about 5027.8051871567. The cubic root of 25278825 is about 293.4848097066.

The spelling of 25278825 in words is "twenty-five million, two hundred seventy-eight thousand, eight hundred twenty-five".