25191642 has 32 divisors (see below), whose sum is σ = 58672512. Its totient is φ = 7061184.

The previous prime is 25191629. The next prime is 25191653. The reversal of 25191642 is 24619152.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3433 + ... + 7884.

It is an arithmetic number, because the mean of its divisors is an integer number (1833516).

Almost surely, 2^25191642 is an apocalyptic number.

25191642 is an abundant number, since it is smaller than the sum of its proper divisors (33480870).

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

25191642 is a wasteful number, since it uses less digits than its factorization.

25191642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11382.

The product of its digits is 4320, while the sum is 30.

The square root of 25191642 is about 5019.1276134404. The cubic root of 25191642 is about 293.1470255755.

The spelling of 25191642 in words is "twenty-five million, one hundred ninety-one thousand, six hundred forty-two".