28726722 has 12 divisors (see below), whose sum is σ = 62241270. Its totient is φ = 9575568.

The previous prime is 28726703. The next prime is 28726751. The reversal of 28726722 is 22762782.

It can be written as a sum of positive squares in only one way, i.e., 28611801 + 114921 = 5349^2 + 339^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 797947 + ... + 797982.

Almost surely, 2^28726722 is an apocalyptic number.

28726722 is an abundant number, since it is smaller than the sum of its proper divisors (33514548).

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

28726722 is a wasteful number, since it uses less digits than its factorization.

28726722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595937 (or 1595934 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 28726722 is about 5359.7315231269. The cubic root of 28726722 is about 306.2635816828.

The spelling of 28726722 in words is "twenty-eight million, seven hundred twenty-six thousand, seven hundred twenty-two".