25308728 has 8 divisors (see below), whose sum is σ = 47453880. Its totient is φ = 12654360.

The previous prime is 25308727. The next prime is 25308737. The reversal of 25308728 is 82780352.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25308721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1581788 + ... + 1581803.

It is an arithmetic number, because the mean of its divisors is an integer number (5931735).

Almost surely, 2^25308728 is an apocalyptic number.

It is an amenable number.

25308728 is a deficient number, since it is larger than the sum of its proper divisors (22145152).

25308728 is a wasteful number, since it uses less digits than its factorization.

25308728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163597 (or 3163593 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 25308728 is about 5030.7780710343. The cubic root of 25308728 is about 293.6004877896.

The spelling of 25308728 in words is "twenty-five million, three hundred eight thousand, seven hundred twenty-eight".