28190930 has 16 divisors (see below), whose sum is σ = 53728920. Its totient is φ = 10612992.

The previous prime is 28190923. The next prime is 28190941. The reversal of 28190930 is 3909182.

It can be written as a sum of positive squares in 4 ways, for example, as 27994681 + 196249 = 5291^2 + 443^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82745 + ... + 83084.

Almost surely, 2^28190930 is an apocalyptic number.

28190930 is a deficient number, since it is larger than the sum of its proper divisors (25537990).

28190930 is a wasteful number, since it uses less digits than its factorization.

28190930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165853.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 28190930 is about 5309.5131603566. The cubic root of 28190930 is about 304.3475437176.

The spelling of 28190930 in words is "twenty-eight million, one hundred ninety thousand, nine hundred thirty".