28431066 has 16 divisors (see below), whose sum is σ = 56916000. Its totient is φ = 9468048.

The previous prime is 28431031. The next prime is 28431071. The reversal of 28431066 is 66013482.

It is a Curzon number.

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, 8800 + ... + 11588.

It is an arithmetic number, because the mean of its divisors is an integer number (3557250).

Almost surely, 2^28431066 is an apocalyptic number.

28431066 is an abundant number, since it is smaller than the sum of its proper divisors (28484934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28431066 is a wasteful number, since it uses less digits than its factorization.

28431066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28431066 is about 5332.0789566547. The cubic root of 28431066 is about 305.2092660428.

The spelling of 28431066 in words is "twenty-eight million, four hundred thirty-one thousand, sixty-six".