28940331 has 12 divisors (see below), whose sum is σ = 44887272. Its totient is φ = 16537248.

The previous prime is 28940321. The next prime is 28940369. The reversal of 28940331 is 13304982.

It is not a de Polignac number, because 28940331 - 2⁵ = 28940299 is a prime.

It is a super-2 number, since 2×28940331² = 1675085516779122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28940311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98290 + ... + 98583.

It is an arithmetic number, because the mean of its divisors is an integer number (3740606).

Almost surely, 2^28940331 is an apocalyptic number.

28940331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28940331 is a deficient number, since it is larger than the sum of its proper divisors (15946941).

28940331 is a wasteful number, since it uses less digits than its factorization.

28940331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196890 (or 196883 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28940331 is about 5379.6218268573. The cubic root of 28940331 is about 307.0208228581.

The spelling of 28940331 in words is "twenty-eight million, nine hundred forty thousand, three hundred thirty-one".