28783120 has 40 divisors (see below), whose sum is σ = 69834816. Its totient is φ = 11011968.

The previous prime is 28783099. The next prime is 28783121. The reversal of 28783120 is 2138782.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28783121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5982 + ... + 9661.

Almost surely, 2^28783120 is an apocalyptic number.

28783120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28783120 is an abundant number, since it is smaller than the sum of its proper divisors (41051696).

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

28783120 is a wasteful number, since it uses less digits than its factorization.

28783120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15679 (or 15673 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28783120 is about 5364.9902143434. The cubic root of 28783120 is about 306.4638755907.

The spelling of 28783120 in words is "twenty-eight million, seven hundred eighty-three thousand, one hundred twenty".