28722789 has 16 divisors (see below), whose sum is σ = 44020800. Its totient is φ = 18487728.

The previous prime is 28722769. The next prime is 28722803. The reversal of 28722789 is 98722782.

It is a happy number.

It is not a de Polignac number, because 28722789 - 2¹⁵ = 28690021 is a prime.

It is a super-3 number, since 3×28722789³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28722739) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 17559 + ... + 19124.

It is an arithmetic number, because the mean of its divisors is an integer number (2751300).

Almost surely, 2^28722789 is an apocalyptic number.

28722789 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28722789 is a deficient number, since it is larger than the sum of its proper divisors (15298011).

28722789 is a wasteful number, since it uses less digits than its factorization.

28722789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36721 (or 36715 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28722789 is about 5359.3646078616. The cubic root of 28722789 is about 306.2496041089.

The spelling of 28722789 in words is "twenty-eight million, seven hundred twenty-two thousand, seven hundred eighty-nine".