25278464 has 24 divisors (see below), whose sum is σ = 50548680. Its totient is φ = 12638208.

The previous prime is 25278443. The next prime is 25278469. The reversal of 25278464 is 46487252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25278469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4124 + ... + 8219.

It is an arithmetic number, because the mean of its divisors is an integer number (2106195).

Almost surely, 2^25278464 is an apocalyptic number.

It is an amenable number.

25278464 is a deficient number, since it is larger than the sum of its proper divisors (25270216).

25278464 is an equidigital number, since it uses as much as digits as its factorization.

25278464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12365 (or 12345 counting only the distinct ones).

The product of its digits is 107520, while the sum is 38.

The square root of 25278464 is about 5027.7692866718. The cubic root of 25278464 is about 293.4834126411.

The spelling of 25278464 in words is "twenty-five million, two hundred seventy-eight thousand, four hundred sixty-four".