28311332 has 24 divisors (see below), whose sum is σ = 56918400. Its totient is φ = 12070080.

The previous prime is 28311331. The next prime is 28311373. The reversal of 28311332 is 23311382.

It is a super-2 number, since 2×28311332² = 1603063039228448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28311298 and 28311307.

It is not an unprimeable number, because it can be changed into a prime (28311331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3032 + ... + 8112.

It is an arithmetic number, because the mean of its divisors is an integer number (2371600).

Almost surely, 2^28311332 is an apocalyptic number.

It is an amenable number.

28311332 is an abundant number, since it is smaller than the sum of its proper divisors (28607068).

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

28311332 is a wasteful number, since it uses less digits than its factorization.

28311332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291 (or 5289 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 28311332 is about 5320.8394074619. The cubic root of 28311332 is about 304.7802125240.

The spelling of 28311332 in words is "twenty-eight million, three hundred eleven thousand, three hundred thirty-two".