28304340 has 48 divisors (see below), whose sum is σ = 80946432. Its totient is φ = 7386496.

The previous prime is 28304327. The next prime is 28304347. The reversal of 28304340 is 4340382.

It is a super-2 number, since 2×28304340² = 1602271325671200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28304340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28304347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2199 + ... + 7838.

It is an arithmetic number, because the mean of its divisors is an integer number (1686384).

Almost surely, 2^28304340 is an apocalyptic number.

28304340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28304340 is an abundant number, since it is smaller than the sum of its proper divisors (52642092).

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

28304340 is a wasteful number, since it uses less digits than its factorization.

28304340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10096 (or 10094 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 28304340 is about 5320.1823277027. The cubic root of 28304340 is about 304.7551201134.

The spelling of 28304340 in words is "twenty-eight million, three hundred four thousand, three hundred forty".