28722988 has 24 divisors (see below), whose sum is σ = 59300864. Its totient is φ = 11912400.

The previous prime is 28722983. The next prime is 28722997. The reversal of 28722988 is 88922782.

It is not an unprimeable number, because it can be changed into a prime (28722983) 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 7 ways as a sum of consecutive naturals, for example, 15678 + ... + 17413.

Almost surely, 2^28722988 is an apocalyptic number.

28722988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28722988 is an abundant number, since it is smaller than the sum of its proper divisors (30577876).

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

28722988 is a wasteful number, since it uses less digits than its factorization.

28722988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33133 (or 33131 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 28722988 is about 5359.3831734632. The cubic root of 28722988 is about 306.2503113699.

The spelling of 28722988 in words is "twenty-eight million, seven hundred twenty-two thousand, nine hundred eighty-eight".