28427330 has 8 divisors (see below), whose sum is σ = 51169212. Its totient is φ = 11370928.

The previous prime is 28427327. The next prime is 28427353. The reversal of 28427330 is 3372482.

It can be written as a sum of positive squares in 2 ways, for example, as 26822041 + 1605289 = 5179^2 + 1267^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28427330² = 1616226181857800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28427293 and 28427302.

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, 1421357 + ... + 1421376.

Almost surely, 2^28427330 is an apocalyptic number.

28427330 is a deficient number, since it is larger than the sum of its proper divisors (22741882).

28427330 is a wasteful number, since it uses less digits than its factorization.

28427330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842740.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 28427330 is about 5331.7286127484. The cubic root of 28427330 is about 305.1958967262.

The spelling of 28427330 in words is "twenty-eight million, four hundred twenty-seven thousand, three hundred thirty".