28423930 has 32 divisors (see below), whose sum is σ = 52390800. Its totient is φ = 11100672.

The previous prime is 28423921. The next prime is 28423961. The reversal of 28423930 is 3932482.

It can be written as a sum of positive squares in 8 ways, for example, as 18139081 + 10284849 = 4259^2 + 3207^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28423892 and 28423901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96864 + ... + 97156.

Almost surely, 2^28423930 is an apocalyptic number.

28423930 is a deficient number, since it is larger than the sum of its proper divisors (23966870).

28423930 is a wasteful number, since it uses less digits than its factorization.

28423930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 28423930 is about 5331.4097572781. The cubic root of 28423930 is about 305.1837287712.

The spelling of 28423930 in words is "twenty-eight million, four hundred twenty-three thousand, nine hundred thirty".