28787922 has 24 divisors (see below), whose sum is σ = 62960976. Its totient is φ = 9505656.

The previous prime is 28787921. The next prime is 28787959. The reversal of 28787922 is 22978782.

It is a happy number.

It is a super-4 number, since 4×28787922⁴ (a number of 31 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (28787921) 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 11 ways as a sum of consecutive naturals, for example, 5548 + ... + 9399.

It is an arithmetic number, because the mean of its divisors is an integer number (2623374).

Almost surely, 2^28787922 is an apocalyptic number.

28787922 is an abundant number, since it is smaller than the sum of its proper divisors (34173054).

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

28787922 is a wasteful number, since it uses less digits than its factorization.

28787922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15062 (or 15059 counting only the distinct ones).

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

The square root of 28787922 is about 5365.4377267843. The cubic root of 28787922 is about 306.4809174969.

It can be divided in two parts, 287 and 87922, that added together give a square (88209 = 297²).

The spelling of 28787922 in words is "twenty-eight million, seven hundred eighty-seven thousand, nine hundred twenty-two".