25698990 has 32 divisors (see below), whose sum is σ = 61839360. Its totient is φ = 6835104.

The previous prime is 25698973. The next prime is 25698991. The reversal of 25698990 is 9989652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25698991) 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, 13731 + ... + 15489.

It is an arithmetic number, because the mean of its divisors is an integer number (1932480).

Almost surely, 2^25698990 is an apocalyptic number.

25698990 is an abundant number, since it is smaller than the sum of its proper divisors (36140370).

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

25698990 is a wasteful number, since it uses less digits than its factorization.

25698990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 25698990 is about 5069.4171262582. The cubic root of 25698990 is about 295.1019086771.

The spelling of 25698990 in words is "twenty-five million, six hundred ninety-eight thousand, nine hundred ninety".