25640736 has 48 divisors (see below), whose sum is σ = 73428768. Its totient is φ = 7769600.

The previous prime is 25640729. The next prime is 25640749. The reversal of 25640736 is 63704652.

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

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 25640697 and 25640706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11085 + ... + 13196.

It is an arithmetic number, because the mean of its divisors is an integer number (1529766).

Almost surely, 2^25640736 is an apocalyptic number.

It is an amenable number.

25640736 is an abundant number, since it is smaller than the sum of its proper divisors (47788032).

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

25640736 is a wasteful number, since it uses less digits than its factorization.

25640736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24305 (or 24297 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 25640736 is about 5063.6682355778. The cubic root of 25640736 is about 294.8787627833.

The spelling of 25640736 in words is "twenty-five million, six hundred forty thousand, seven hundred thirty-six".