25640996 has 6 divisors (see below), whose sum is σ = 44871750. Its totient is φ = 12820496.

The previous prime is 25640983. The next prime is 25641047. The reversal of 25640996 is 69904652.

It can be written as a sum of positive squares in only one way, i.e., 24364096 + 1276900 = 4936^2 + 1130^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3205121 + ... + 3205128.

It is an arithmetic number, because the mean of its divisors is an integer number (7478625).

Almost surely, 2^25640996 is an apocalyptic number.

It is an amenable number.

25640996 is a deficient number, since it is larger than the sum of its proper divisors (19230754).

25640996 is a wasteful number, since it uses less digits than its factorization.

25640996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410253 (or 6410251 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 25640996 is about 5063.6939086007. The cubic root of 25640996 is about 294.8797594814.

The spelling of 25640996 in words is "twenty-five million, six hundred forty thousand, nine hundred ninety-six".