28321992 has 24 divisors (see below), whose sum is σ = 76705590. Its totient is φ = 9440640.

The previous prime is 28321991. The next prime is 28321999. The reversal of 28321992 is 29912382.

It can be written as a sum of positive squares in only one way, i.e., 26563716 + 1758276 = 5154^2 + 1326^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28321991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 196609 + ... + 196752.

Almost surely, 2^28321992 is an apocalyptic number.

It is an amenable number.

28321992 is an abundant number, since it is smaller than the sum of its proper divisors (48383598).

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

28321992 is a wasteful number, since it uses less digits than its factorization.

28321992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393373 (or 393366 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28321992 is about 5321.8410348300. The cubic root of 28321992 is about 304.8184604522.

The spelling of 28321992 in words is "twenty-eight million, three hundred twenty-one thousand, nine hundred ninety-two".