28151930 has 16 divisors (see below), whose sum is σ = 50810760. Its totient is φ = 11230272.

The previous prime is 28151899. The next prime is 28151941. The reversal of 28151930 is 3915182.

It can be written as a sum of positive squares in 4 ways, for example, as 21187609 + 6964321 = 4603^2 + 2639^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28151893 and 28151902.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 272 + ... + 7508.

Almost surely, 2^28151930 is an apocalyptic number.

28151930 is a deficient number, since it is larger than the sum of its proper divisors (22658830).

28151930 is a wasteful number, since it uses less digits than its factorization.

28151930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7633.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 28151930 is about 5305.8392361624. The cubic root of 28151930 is about 304.2071317487.

The spelling of 28151930 in words is "twenty-eight million, one hundred fifty-one thousand, nine hundred thirty".