28724503444 has 216 divisors, whose sum is σ = 65958177600. Its totient is φ = 10933610688.

The previous prime is 28724503429. The next prime is 28724503453. The reversal of 28724503444 is 44430542782.

It is a happy number.

It is a super-2 number, since 2×28724503444² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 28724503444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 428723899 + ... + 428723965.

Almost surely, 2^28724503444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28724503444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32979088800).

28724503444 is an abundant number, since it is smaller than the sum of its proper divisors (37233674156).

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

28724503444 is a wasteful number, since it uses less digits than its factorization.

28724503444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 43.

The spelling of 28724503444 in words is "twenty-eight billion, seven hundred twenty-four million, five hundred three thousand, four hundred forty-four".