28333290 has 48 divisors (see below), whose sum is σ = 70488288. Its totient is φ = 7288512.

The previous prime is 28333289. The next prime is 28333301. The reversal of 28333290 is 9233382.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24669 + ... + 25791.

It is an arithmetic number, because the mean of its divisors is an integer number (1468506).

Almost surely, 2^28333290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28333290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35244144).

28333290 is an abundant number, since it is smaller than the sum of its proper divisors (42154998).

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

28333290 is a wasteful number, since it uses less digits than its factorization.

28333290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 28333290 is about 5322.9024037643. The cubic root of 28333290 is about 304.8589870406.

The spelling of 28333290 in words is "twenty-eight million, three hundred thirty-three thousand, two hundred ninety".