24993990 has 96 divisors (see below), whose sum is σ = 75216960. Its totient is φ = 5640192.

The previous prime is 24993971. The next prime is 24994003. The reversal of 24993990 is 9939942.

It is a super-2 number, since 2×24993990² = 1249399072240200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60906 + ... + 61314.

It is an arithmetic number, because the mean of its divisors is an integer number (783510).

Almost surely, 2^24993990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 24993990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37608480).

24993990 is an abundant number, since it is smaller than the sum of its proper divisors (50222970).

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

24993990 is a wasteful number, since it uses less digits than its factorization.

24993990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 24993990 is about 4999.3989638756. The cubic root of 24993990 is about 292.3783408146.

The spelling of 24993990 in words is "twenty-four million, nine hundred ninety-three thousand, nine hundred ninety".