28709401824 has 72 divisors (see below), whose sum is σ = 82162505880. Its totient is φ = 9508831488.

The previous prime is 28709401789. The next prime is 28709401841. The reversal of 28709401824 is 42810490782.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 28709401824.

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 11 ways as a sum of consecutive naturals, for example, 272254 + ... + 362685.

It is an arithmetic number, because the mean of its divisors is an integer number (1141145915).

Almost surely, 2^28709401824 is an apocalyptic number.

28709401824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28709401824 is an abundant number, since it is smaller than the sum of its proper divisors (53453104056).

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

28709401824 is a wasteful number, since it uses less digits than its factorization.

28709401824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635112 (or 635101 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 28709401824 in words is "twenty-eight billion, seven hundred nine million, four hundred one thousand, eight hundred twenty-four".