25398728 has 8 divisors (see below), whose sum is σ = 47622630. Its totient is φ = 12699360.

The previous prime is 25398727. The next prime is 25398787. The reversal of 25398728 is 82789352.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 11276164 = 3758^2 + 3358^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (25398727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1587413 + ... + 1587428.

Almost surely, 2^25398728 is an apocalyptic number.

It is an amenable number.

25398728 is a deficient number, since it is larger than the sum of its proper divisors (22223902).

25398728 is a wasteful number, since it uses less digits than its factorization.

25398728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174847 (or 3174843 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 25398728 is about 5039.7150713111. The cubic root of 25398728 is about 293.9480988796.

The spelling of 25398728 in words is "twenty-five million, three hundred ninety-eight thousand, seven hundred twenty-eight".