28321974 has 40 divisors (see below), whose sum is σ = 64294560. Its totient is φ = 9316944.

The previous prime is 28321973. The next prime is 28321991. The reversal of 28321974 is 47912382.

It is a super-2 number, since 2×28321974² = 1604268422513352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11692 + ... + 13904.

It is an arithmetic number, because the mean of its divisors is an integer number (1607364).

Almost surely, 2^28321974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28321974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32147280).

28321974 is an abundant number, since it is smaller than the sum of its proper divisors (35972586).

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

28321974 is a wasteful number, since it uses less digits than its factorization.

28321974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2297 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28321974 is about 5321.8393436856. The cubic root of 28321974 is about 304.8183958765.

The spelling of 28321974 in words is "twenty-eight million, three hundred twenty-one thousand, nine hundred seventy-four".