28731722 has 8 divisors (see below), whose sum is σ = 43178016. Its totient is φ = 14339052.

The previous prime is 28731713. The next prime is 28731727. The reversal of 28731722 is 22713782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28731727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12038 + ... + 14225.

It is an arithmetic number, because the mean of its divisors is an integer number (5397252).

Almost surely, 2^28731722 is an apocalyptic number.

28731722 is a deficient number, since it is larger than the sum of its proper divisors (14446294).

28731722 is a wasteful number, since it uses less digits than its factorization.

28731722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26812.

The product of its digits is 9408, while the sum is 32.

The square root of 28731722 is about 5360.1979441062. The cubic root of 28731722 is about 306.2813494494.

The spelling of 28731722 in words is "twenty-eight million, seven hundred thirty-one thousand, seven hundred twenty-two".