28405323 has 20 divisors (see below), whose sum is σ = 44668360. Its totient is φ = 17939232.

The previous prime is 28405303. The next prime is 28405337. The reversal of 28405323 is 32350482.

It is not a de Polignac number, because 28405323 - 2⁶ = 28405259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28405303) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7690 + ... + 10767.

It is an arithmetic number, because the mean of its divisors is an integer number (2233418).

Almost surely, 2^28405323 is an apocalyptic number.

28405323 is a deficient number, since it is larger than the sum of its proper divisors (16263037).

28405323 is a wasteful number, since it uses less digits than its factorization.

28405323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18488 (or 18479 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 28405323 is about 5329.6644359659. The cubic root of 28405323 is about 305.1171206561.

The spelling of 28405323 in words is "twenty-eight million, four hundred five thousand, three hundred twenty-three".