28279373664 has 96 divisors (see below), whose sum is σ = 78242461920. Its totient is φ = 8929636352.

The previous prime is 28279373663. The next prime is 28279373669. The reversal of 28279373664 is 46637397282.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279373663) by changing a digit.

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, 51724 + ... + 243380.

It is an arithmetic number, because the mean of its divisors is an integer number (815025645).

Almost surely, 2^28279373664 is an apocalyptic number.

28279373664 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 28279373664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39121230960).

28279373664 is an abundant number, since it is smaller than the sum of its proper divisors (49963088256).

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

28279373664 is a wasteful number, since it uses less digits than its factorization.

28279373664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191752 (or 191744 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 57.

The spelling of 28279373664 in words is "twenty-eight billion, two hundred seventy-nine million, three hundred seventy-three thousand, six hundred sixty-four".