25640798 has 8 divisors (see below), whose sum is σ = 39003120. Its totient is φ = 12639760.

The previous prime is 25640789. The next prime is 25640807. The reversal of 25640798 is 89704652.

It is an interprime number because it is at equal distance from previous prime (25640789) and next prime (25640807).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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, 90143 + ... + 90426.

It is an arithmetic number, because the mean of its divisors is an integer number (4875390).

Almost surely, 2^25640798 is an apocalyptic number.

25640798 is a deficient number, since it is larger than the sum of its proper divisors (13362322).

25640798 is a wasteful number, since it uses less digits than its factorization.

25640798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180642.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 25640798 is about 5063.6743576182. The cubic root of 25640798 is about 294.8790004580.

The spelling of 25640798 in words is "twenty-five million, six hundred forty thousand, seven hundred ninety-eight".