28313620 has 12 divisors (see below), whose sum is σ = 59458644. Its totient is φ = 11325440.

The previous prime is 28313617. The next prime is 28313627. The reversal of 28313620 is 2631382.

It can be written as a sum of positive squares in 2 ways, for example, as 4048144 + 24265476 = 2012^2 + 4926^2 .

It is a super-2 number, since 2×28313620² = 1603322155008800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28313627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707821 + ... + 707860.

It is an arithmetic number, because the mean of its divisors is an integer number (4954887).

Almost surely, 2^28313620 is an apocalyptic number.

28313620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28313620 is an abundant number, since it is smaller than the sum of its proper divisors (31145024).

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

28313620 is a wasteful number, since it uses less digits than its factorization.

28313620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415690 (or 1415688 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 28313620 is about 5321.0544067882. The cubic root of 28313620 is about 304.7884226445.

The spelling of 28313620 in words is "twenty-eight million, three hundred thirteen thousand, six hundred twenty".