28313964 has 72 divisors (see below), whose sum is σ = 83501600. Its totient is φ = 8086176.

The previous prime is 28313963. The next prime is 28313969. The reversal of 28313964 is 46931382.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28313963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11202 + ... + 13494.

Almost surely, 2^28313964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28313964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41750800).

28313964 is an abundant number, since it is smaller than the sum of its proper divisors (55187636).

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

28313964 is a wasteful number, since it uses less digits than its factorization.

28313964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324 (or 2305 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 28313964 is about 5321.0867311105. The cubic root of 28313964 is about 304.7896569950.

The spelling of 28313964 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred sixty-four".