28123458 has 64 divisors (see below), whose sum is σ = 66286080. Its totient is φ = 7862400.

The previous prime is 28123427. The next prime is 28123483. The reversal of 28123458 is 85432182.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51141 + ... + 51687.

It is an arithmetic number, because the mean of its divisors is an integer number (1035720).

Almost surely, 2^28123458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28123458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33143040).

28123458 is an abundant number, since it is smaller than the sum of its proper divisors (38162622).

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

28123458 is a wasteful number, since it uses less digits than its factorization.

28123458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623.

The product of its digits is 15360, while the sum is 33.

The square root of 28123458 is about 5303.1554757521. The cubic root of 28123458 is about 304.1045418961.

The spelling of 28123458 in words is "twenty-eight million, one hundred twenty-three thousand, four hundred fifty-eight".