25278816 has 48 divisors (see below), whose sum is σ = 69854400. Its totient is φ = 7982208.

The previous prime is 25278811. The next prime is 25278821. The reversal of 25278816 is 61887252.

25278816 = T₄₅₆ + T₄₅₇ + ... + T₆₂₆.

It is an interprime number because it is at equal distance from previous prime (25278811) and next prime (25278821).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25278811) 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, 5106 + ... + 8753.

It is an arithmetic number, because the mean of its divisors is an integer number (1455300).

Almost surely, 2^25278816 is an apocalyptic number.

It is an amenable number.

25278816 is an abundant number, since it is smaller than the sum of its proper divisors (44575584).

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

25278816 is a wasteful number, since it uses less digits than its factorization.

25278816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13891 (or 13883 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 25278816 is about 5027.8042921339. The cubic root of 25278816 is about 293.4847748768.

The spelling of 25278816 in words is "twenty-five million, two hundred seventy-eight thousand, eight hundred sixteen".