28671990 has 32 divisors (see below), whose sum is σ = 68968800. Its totient is φ = 7628544.

The previous prime is 28671989. The next prime is 28672037. The reversal of 28671990 is 9917682.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17736 + ... + 19284.

It is an arithmetic number, because the mean of its divisors is an integer number (2155275).

Almost surely, 2^28671990 is an apocalyptic number.

28671990 is an abundant number, since it is smaller than the sum of its proper divisors (40296810).

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

28671990 is a wasteful number, since it uses less digits than its factorization.

28671990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 28671990 is about 5354.6232360457. The cubic root of 28671990 is about 306.0689536608.

The spelling of 28671990 in words is "twenty-eight million, six hundred seventy-one thousand, nine hundred ninety".