28286722 has 8 divisors (see below), whose sum is σ = 43576956. Its totient is φ = 13761072.

The previous prime is 28286719. The next prime is 28286729. The reversal of 28286722 is 22768282.

It can be written as a sum of positive squares in 2 ways, for example, as 24710841 + 3575881 = 4971^2 + 1891^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (28286729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191053 + ... + 191200.

Almost surely, 2^28286722 is an apocalyptic number.

28286722 is a deficient number, since it is larger than the sum of its proper divisors (15290234).

28286722 is a wasteful number, since it uses less digits than its factorization.

28286722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382292.

The product of its digits is 43008, while the sum is 37.

The square root of 28286722 is about 5318.5262996435. The cubic root of 28286722 is about 304.6918755120.

The spelling of 28286722 in words is "twenty-eight million, two hundred eighty-six thousand, seven hundred twenty-two".