24921492864 has 128 divisors (see below), whose sum is σ = 69344985600. Its totient is φ = 7915032576.

The previous prime is 24921492853. The next prime is 24921492877. The reversal of 24921492864 is 46829412942.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2317452 + ... + 2328180.

It is an arithmetic number, because the mean of its divisors is an integer number (541757700).

Almost surely, 2^24921492864 is an apocalyptic number.

24921492864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 24921492864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34672492800).

24921492864 is an abundant number, since it is smaller than the sum of its proper divisors (44423492736).

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

24921492864 is a wasteful number, since it uses less digits than its factorization.

24921492864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11032 (or 11020 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 51.

The spelling of 24921492864 in words is "twenty-four billion, nine hundred twenty-one million, four hundred ninety-two thousand, eight hundred sixty-four".