28427681992 has 8 divisors (see below), whose sum is σ = 53301903750. Its totient is φ = 14213840992.

The previous prime is 28427681983. The next prime is 28427681999. The reversal of 28427681992 is 29918672482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18734491876 + 9693190116 = 136874^2 + 98454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28427681999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1776730117 + ... + 1776730132.

Almost surely, 2^28427681992 is an apocalyptic number.

It is an amenable number.

28427681992 is a deficient number, since it is larger than the sum of its proper divisors (24874221758).

28427681992 is a wasteful number, since it uses less digits than its factorization.

28427681992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553460255 (or 3553460251 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The spelling of 28427681992 in words is "twenty-eight billion, four hundred twenty-seven million, six hundred eighty-one thousand, nine hundred ninety-two".