24891990 has 16 divisors (see below), whose sum is σ = 59740848. Its totient is φ = 6637856.

The previous prime is 24891989. The next prime is 24891991. The reversal of 24891990 is 9919842.

It is an interprime number because it is at equal distance from previous prime (24891989) and next prime (24891991).

It is a super-2 number, since 2×24891990² = 1239222332320200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24891991) 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, 414837 + ... + 414896.

It is an arithmetic number, because the mean of its divisors is an integer number (3733803).

Almost surely, 2^24891990 is an apocalyptic number.

24891990 is an abundant number, since it is smaller than the sum of its proper divisors (34848858).

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

24891990 is a wasteful number, since it uses less digits than its factorization.

24891990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829743.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 24891990 is about 4989.1873085704. The cubic root of 24891990 is about 291.9800683837.

The spelling of 24891990 in words is "twenty-four million, eight hundred ninety-one thousand, nine hundred ninety".