28388723 has 8 divisors (see below), whose sum is σ = 31254960. Its totient is φ = 25570080.

The previous prime is 28388713. The next prime is 28388741. The reversal of 28388723 is 32788382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28388723 - 2²⁰ = 27340147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28388713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10640 + ... + 13037.

It is an arithmetic number, because the mean of its divisors is an integer number (3906870).

Almost surely, 2^28388723 is an apocalyptic number.

28388723 is a deficient number, since it is larger than the sum of its proper divisors (2866237).

28388723 is a wasteful number, since it uses less digits than its factorization.

28388723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23797.

The product of its digits is 129024, while the sum is 41.

The square root of 28388723 is about 5328.1068870660. The cubic root of 28388723 is about 305.0576725124.

The spelling of 28388723 in words is "twenty-eight million, three hundred eighty-eight thousand, seven hundred twenty-three".