28001956 has 12 divisors (see below), whose sum is σ = 49047040. Its totient is φ = 13988520.

The previous prime is 28001951. The next prime is 28001977. The reversal of 28001956 is 65910082.

It is not an unprimeable number, because it can be changed into a prime (28001951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505 + ... + 8263.

Almost surely, 2^28001956 is an apocalyptic number.

It is an amenable number.

28001956 is a deficient number, since it is larger than the sum of its proper divisors (21045084).

28001956 is a wasteful number, since it uses less digits than its factorization.

28001956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6234 (or 6232 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 28001956 is about 5291.6874435288. The cubic root of 28001956 is about 303.6659679372.

The spelling of 28001956 in words is "twenty-eight million, one thousand, nine hundred fifty-six".