28081815732 has 36 divisors (see below), whose sum is σ = 71648006976. Its totient is φ = 9273121680.

The previous prime is 28081815731. The next prime is 28081815739. The reversal of 28081815732 is 23751818082.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081815731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3641244 + ... + 3648947.

It is an arithmetic number, because the mean of its divisors is an integer number (1990222416).

Almost surely, 2^28081815732 is an apocalyptic number.

It is an amenable number.

28081815732 is an abundant number, since it is smaller than the sum of its proper divisors (43566191244).

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

28081815732 is a wasteful number, since it uses less digits than its factorization.

28081815732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290308 (or 7290303 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 28081815732 in words is "twenty-eight billion, eighty-one million, eight hundred fifteen thousand, seven hundred thirty-two".