28683940 has 24 divisors (see below), whose sum is σ = 60338880. Its totient is φ = 11454048.

The previous prime is 28683937. The next prime is 28683943. The reversal of 28683940 is 4938682.

It is an interprime number because it is at equal distance from previous prime (28683937) and next prime (28683943).

It is a junction number, because it is equal to n+sod(n) for n = 28683893 and 28683902.

It is not an unprimeable number, because it can be changed into a prime (28683943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18931 + ... + 20389.

It is an arithmetic number, because the mean of its divisors is an integer number (2514120).

Almost surely, 2^28683940 is an apocalyptic number.

28683940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28683940 is an abundant number, since it is smaller than the sum of its proper divisors (31654940).

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

28683940 is a wasteful number, since it uses less digits than its factorization.

28683940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451 (or 2449 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 28683940 is about 5355.7389779563. The cubic root of 28683940 is about 306.1114692074. Note that the first 3 decimals are identical.

The spelling of 28683940 in words is "twenty-eight million, six hundred eighty-three thousand, nine hundred forty".