7722728 has 16 divisors (see below), whose sum is σ = 15594180. Its totient is φ = 3564288.

The previous prime is 7722707. The next prime is 7722731. The reversal of 7722728 is 8272277.

It can be written as a sum of positive squares in 2 ways, for example, as 5654884 + 2067844 = 2378^2 + 1438^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37025 + ... + 37232.

Almost surely, 2^7722728 is an apocalyptic number.

It is an amenable number.

7722728 is an abundant number, since it is smaller than the sum of its proper divisors (7871452).

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

7722728 is a wasteful number, since it uses less digits than its factorization.

7722728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74276 (or 74272 counting only the distinct ones).

The product of its digits is 21952, while the sum is 35.

The square root of 7722728 is about 2778.9796688713. The cubic root of 7722728 is about 197.6621794515.

The spelling of 7722728 in words is "seven million, seven hundred twenty-two thousand, seven hundred twenty-eight".