28902931 has 4 divisors (see below), whose sum is σ = 28944864. Its totient is φ = 28861000.

The previous prime is 28902917. The next prime is 28902953. The reversal of 28902931 is 13920982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28902931 - 2⁵ = 28902899 is a prime.

It is a super-2 number, since 2×28902931² = 1670758840781522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28902961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19915 + ... + 21316.

It is an arithmetic number, because the mean of its divisors is an integer number (7236216).

Almost surely, 2^28902931 is an apocalyptic number.

28902931 is a deficient number, since it is larger than the sum of its proper divisors (41933).

28902931 is an equidigital number, since it uses as much as digits as its factorization.

28902931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41932.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 28902931 is about 5376.1446223107. The cubic root of 28902931 is about 306.8885100579. Note that the first 3 decimals are identical.

The spelling of 28902931 in words is "twenty-eight million, nine hundred two thousand, nine hundred thirty-one".