25640087 has 8 divisors (see below), whose sum is σ = 28106112. Its totient is φ = 23196600.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640087 is 78004652.

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

It is a cyclic number.

It is not a de Polignac number, because 25640087 - 2⁴ = 25640071 is a prime.

It is a super-2 number, since 2×25640087² = 1314828122735138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3203 + ... + 7844.

It is an arithmetic number, because the mean of its divisors is an integer number (3513264).

Almost surely, 2^25640087 is an apocalyptic number.

25640087 is a deficient number, since it is larger than the sum of its proper divisors (2466025).

25640087 is a wasteful number, since it uses less digits than its factorization.

25640087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11269.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 25640087 is about 5063.6041511951. The cubic root of 25640087 is about 294.8762748421.

The spelling of 25640087 in words is "twenty-five million, six hundred forty thousand, eighty-seven".