28721854 has 16 divisors (see below), whose sum is σ = 49308768. Its totient is φ = 12291552.

The previous prime is 28721831. The next prime is 28721873. The reversal of 28721854 is 45812782.

It is a congruent 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, 14364 + ... + 16240.

It is an arithmetic number, because the mean of its divisors is an integer number (3081798).

Almost surely, 2^28721854 is an apocalyptic number.

28721854 is a deficient number, since it is larger than the sum of its proper divisors (20586914).

28721854 is a wasteful number, since it uses less digits than its factorization.

28721854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979.

The product of its digits is 35840, while the sum is 37.

The square root of 28721854 is about 5359.2773766619. The cubic root of 28721854 is about 306.2462810044.

The spelling of 28721854 in words is "twenty-eight million, seven hundred twenty-one thousand, eight hundred fifty-four".