25679990 has 32 divisors (see below), whose sum is σ = 53581824. Its totient is φ = 8678880.

The previous prime is 25679989. The next prime is 25679999. The reversal of 25679990 is 9997652.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25679999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2387 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (1674432).

Almost surely, 2^25679990 is an apocalyptic number.

25679990 is an abundant number, since it is smaller than the sum of its proper divisors (27901834).

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

25679990 is a wasteful number, since it uses less digits than its factorization.

25679990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 25679990 is about 5067.5427970566. The cubic root of 25679990 is about 295.0291649802.

The spelling of 25679990 in words is "twenty-five million, six hundred seventy-nine thousand, nine hundred ninety".