28212722 has 8 divisors (see below), whose sum is σ = 43462956. Its totient is φ = 13725072.

The previous prime is 28212721. The next prime is 28212731. The reversal of 28212722 is 22721282.

It can be written as a sum of positive squares in 2 ways, for example, as 27888961 + 323761 = 5281^2 + 569^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28212691 and 28212700.

It is not an unprimeable number, because it can be changed into a prime (28212721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190553 + ... + 190700.

Almost surely, 2^28212722 is an apocalyptic number.

28212722 is a deficient number, since it is larger than the sum of its proper divisors (15250234).

28212722 is a wasteful number, since it uses less digits than its factorization.

28212722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381292.

The product of its digits is 1792, while the sum is 26.

The square root of 28212722 is about 5311.5649294723. The cubic root of 28212722 is about 304.4259452157.

The spelling of 28212722 in words is "twenty-eight million, two hundred twelve thousand, seven hundred twenty-two".