28749738624 has 64 divisors (see below), whose sum is σ = 76448951040. Its totient is φ = 9572898816.

The previous prime is 28749738593. The next prime is 28749738629. The reversal of 28749738624 is 42683794782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (28749738629) 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, 319857 + ... + 399759.

It is an arithmetic number, because the mean of its divisors is an integer number (1194514860).

Almost surely, 2^28749738624 is an apocalyptic number.

28749738624 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 28749738624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38224475520).

28749738624 is an abundant number, since it is smaller than the sum of its proper divisors (47699212416).

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

28749738624 is an equidigital number, since it uses as much as digits as its factorization.

28749738624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80857 (or 80845 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 60.

The spelling of 28749738624 in words is "twenty-eight billion, seven hundred forty-nine million, seven hundred thirty-eight thousand, six hundred twenty-four".