24991990 has 16 divisors (see below), whose sum is σ = 45407952. Its totient is φ = 9902944.

The previous prime is 24991979. The next prime is 24992039. The reversal of 24991990 is 9919942.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10609 + ... + 12748.

It is an arithmetic number, because the mean of its divisors is an integer number (2837997).

Almost surely, 2^24991990 is an apocalyptic number.

24991990 is a deficient number, since it is larger than the sum of its proper divisors (20415962).

24991990 is a wasteful number, since it uses less digits than its factorization.

24991990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23471.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 24991990 is about 4999.1989358296. The cubic root of 24991990 is about 292.3705419760.

It can be divided in two parts, 2499 and 1990, that added together give a square (4489 = 67²).

The spelling of 24991990 in words is "twenty-four million, nine hundred ninety-one thousand, nine hundred ninety".