28406992 has 20 divisors (see below), whose sum is σ = 55286020. Its totient is φ = 14139648.

The previous prime is 28406929. The next prime is 28407011. The reversal of 28406992 is 29960482.

It can be written as a sum of positive squares in 2 ways, for example, as 27625536 + 781456 = 5256^2 + 884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213 + ... + 7540.

It is an arithmetic number, because the mean of its divisors is an integer number (2764301).

Almost surely, 2^28406992 is an apocalyptic number.

It is an amenable number.

28406992 is a deficient number, since it is larger than the sum of its proper divisors (26879028).

28406992 is a wasteful number, since it uses less digits than its factorization.

28406992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7990 (or 7984 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 28406992 is about 5329.8210101278. The cubic root of 28406992 is about 305.1230964199.

The spelling of 28406992 in words is "twenty-eight million, four hundred six thousand, nine hundred ninety-two".