28544449920 has 512 divisors, whose sum is σ = 109645332480. Its totient is φ = 6175285248.

The previous prime is 28544449859. The next prime is 28544449951. The reversal of 28544449920 is 2994444582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33075409 + ... + 33076271.

It is an arithmetic number, because the mean of its divisors is an integer number (214151040).

Almost surely, 2^28544449920 is an apocalyptic number.

28544449920 is a gapful number since it is divisible by the number (20) 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 28544449920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54822666240).

28544449920 is an abundant number, since it is smaller than the sum of its proper divisors (81100882560).

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

28544449920 is a wasteful number, since it uses less digits than its factorization.

28544449920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 51.

The spelling of 28544449920 in words is "twenty-eight billion, five hundred forty-four million, four hundred forty-nine thousand, nine hundred twenty".