28793820 has 48 divisors (see below), whose sum is σ = 87954048. Its totient is φ = 6980160.

The previous prime is 28793813. The next prime is 28793827. The reversal of 28793820 is 2839782.

It is an interprime number because it is at equal distance from previous prime (28793813) and next prime (28793827).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28793827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21154 + ... + 22473.

It is an arithmetic number, because the mean of its divisors is an integer number (1832376).

Almost surely, 2^28793820 is an apocalyptic number.

28793820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28793820 is an abundant number, since it is smaller than the sum of its proper divisors (59160228).

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

28793820 is a wasteful number, since it uses less digits than its factorization.

28793820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43650 (or 43648 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28793820 is about 5365.9873276034. The cubic root of 28793820 is about 306.5018464247.

The spelling of 28793820 in words is "twenty-eight million, seven hundred ninety-three thousand, eight hundred twenty".