28913783 has 16 divisors (see below), whose sum is σ = 31726080. Its totient is φ = 26263776.

The previous prime is 28913749. The next prime is 28913791. The reversal of 28913783 is 38731982.

It is a cyclic number.

It is not a de Polignac number, because 28913783 - 2⁸ = 28913527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28913783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28913723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44366 + ... + 45012.

It is an arithmetic number, because the mean of its divisors is an integer number (1982880).

Almost surely, 2^28913783 is an apocalyptic number.

28913783 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28913783 is a deficient number, since it is larger than the sum of its proper divisors (2812297).

28913783 is a wasteful number, since it uses less digits than its factorization.

28913783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766.

The product of its digits is 72576, while the sum is 41.

The square root of 28913783 is about 5377.1538010364. The cubic root of 28913783 is about 306.9269137454.

The spelling of 28913783 in words is "twenty-eight million, nine hundred thirteen thousand, seven hundred eighty-three".