28752722 has 4 divisors (see below), whose sum is σ = 43129086. Its totient is φ = 14376360.

The previous prime is 28752721. The next prime is 28752727. The reversal of 28752722 is 22725782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22725782 = 2 ⋅11362891.

It can be written as a sum of positive squares in only one way, i.e., 21724921 + 7027801 = 4661^2 + 2651^2 .

It is not an unprimeable number, because it can be changed into a prime (28752721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7188179 + ... + 7188182.

Almost surely, 2^28752722 is an apocalyptic number.

28752722 is a deficient number, since it is larger than the sum of its proper divisors (14376364).

28752722 is a wasteful number, since it uses less digits than its factorization.

28752722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14376363.

The product of its digits is 31360, while the sum is 35.

The square root of 28752722 is about 5362.1564691829. The cubic root of 28752722 is about 306.3559515674.

The spelling of 28752722 in words is "twenty-eight million, seven hundred fifty-two thousand, seven hundred twenty-two".