28730812 has 24 divisors (see below), whose sum is σ = 57738240. Its totient is φ = 12371760.

The previous prime is 28730809. The next prime is 28730813. The reversal of 28730812 is 21803782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28730813) 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, 16348 + ... + 18019.

It is an arithmetic number, because the mean of its divisors is an integer number (2405760).

Almost surely, 2^28730812 is an apocalyptic number.

28730812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28730812 is an abundant number, since it is smaller than the sum of its proper divisors (29007428).

28730812 is a wasteful number, since it uses less digits than its factorization.

28730812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34401 (or 34399 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28730812 is about 5360.1130585091. The cubic root of 28730812 is about 306.2781158693.

The spelling of 28730812 in words is "twenty-eight million, seven hundred thirty thousand, eight hundred twelve".