28379772 has 36 divisors (see below), whose sum is σ = 72727200. Its totient is φ = 9329472.

The previous prime is 28379753. The next prime is 28379773. The reversal of 28379772 is 27797382.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28379772² = 1610822917543968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28379773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2772 + ... + 8027.

It is an arithmetic number, because the mean of its divisors is an integer number (2020200).

Almost surely, 2^28379772 is an apocalyptic number.

It is an amenable number.

28379772 is an abundant number, since it is smaller than the sum of its proper divisors (44347428).

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

28379772 is a wasteful number, since it uses less digits than its factorization.

28379772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10882 (or 10877 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 28379772 is about 5327.2668414488. The cubic root of 28379772 is about 305.0256074531.

The spelling of 28379772 in words is "twenty-eight million, three hundred seventy-nine thousand, seven hundred seventy-two".