25429728 has 24 divisors (see below), whose sum is σ = 66753288. Its totient is φ = 8476544.

The previous prime is 25429709. The next prime is 25429751. The reversal of 25429728 is 82792452.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132351 + ... + 132542.

It is an arithmetic number, because the mean of its divisors is an integer number (2781387).

Almost surely, 2^25429728 is an apocalyptic number.

It is an amenable number.

25429728 is an abundant number, since it is smaller than the sum of its proper divisors (41323560).

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

25429728 is a wasteful number, since it uses less digits than its factorization.

25429728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264906 (or 264898 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 25429728 is about 5042.7897041221. The cubic root of 25429728 is about 294.0676414311.

The spelling of 25429728 in words is "twenty-five million, four hundred twenty-nine thousand, seven hundred twenty-eight".