28031396 has 12 divisors (see below), whose sum is σ = 49112448. Its totient is φ = 13999272.

The previous prime is 28031389. The next prime is 28031401. The reversal of 28031396 is 69313082.

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, 245 + ... + 7491.

It is an arithmetic number, because the mean of its divisors is an integer number (4092704).

Almost surely, 2^28031396 is an apocalyptic number.

It is an amenable number.

28031396 is a deficient number, since it is larger than the sum of its proper divisors (21081052).

28031396 is a wasteful number, since it uses less digits than its factorization.

28031396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8218 (or 8216 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 28031396 is about 5294.4684341301. The cubic root of 28031396 is about 303.7723509213.

The spelling of 28031396 in words is "twenty-eight million, thirty-one thousand, three hundred ninety-six".