28313940 has 48 divisors (see below), whose sum is σ = 79531200. Its totient is φ = 7526400.

The previous prime is 28313939. The next prime is 28313941. The reversal of 28313940 is 4931382.

It is an interprime number because it is at equal distance from previous prime (28313939) and next prime (28313941).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28313898 and 28313907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28313941) 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, 26415 + ... + 27465.

It is an arithmetic number, because the mean of its divisors is an integer number (1656900).

Almost surely, 2^28313940 is an apocalyptic number.

28313940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28313940 is an abundant number, since it is smaller than the sum of its proper divisors (51217260).

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

28313940 is a wasteful number, since it uses less digits than its factorization.

28313940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512 (or 1510 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28313940 is about 5321.0844759316. The cubic root of 28313940 is about 304.7895708779.

The spelling of 28313940 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred forty".