28121672 has 32 divisors (see below), whose sum is σ = 58773600. Its totient is φ = 12536064.

The previous prime is 28121657. The next prime is 28121707. The reversal of 28121672 is 27612182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2858 + ... + 8025.

It is an arithmetic number, because the mean of its divisors is an integer number (1836675).

Almost surely, 2^28121672 is an apocalyptic number.

It is an amenable number.

28121672 is an abundant number, since it is smaller than the sum of its proper divisors (30651928).

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

28121672 is a wasteful number, since it uses less digits than its factorization.

28121672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10925 (or 10921 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 28121672 is about 5302.9870827676. The cubic root of 28121672 is about 304.0981043021.

The spelling of 28121672 in words is "twenty-eight million, one hundred twenty-one thousand, six hundred seventy-two".