28393430 has 32 divisors (see below), whose sum is σ = 56536704. Its totient is φ = 10198656.

The previous prime is 28393411. The next prime is 28393441. The reversal of 28393430 is 3439382.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 1859 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (1766772).

Almost surely, 2^28393430 is an apocalyptic number.

28393430 is a deficient number, since it is larger than the sum of its proper divisors (28143274).

28393430 is a wasteful number, since it uses less digits than its factorization.

28393430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5960.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 28393430 is about 5328.5485828694. The cubic root of 28393430 is about 305.0745316377.

The spelling of 28393430 in words is "twenty-eight million, three hundred ninety-three thousand, four hundred thirty".