28730736 has 60 divisors (see below), whose sum is σ = 84646120. Its totient is φ = 9072000.

The previous prime is 28730729. The next prime is 28730761. The reversal of 28730736 is 63703782.

It is a super-2 number, since 2×28730736² = 1650910382203392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28730736.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2515 + ... + 7986.

Almost surely, 2^28730736 is an apocalyptic number.

It is an amenable number.

28730736 is an abundant number, since it is smaller than the sum of its proper divisors (55915384).

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

28730736 is a wasteful number, since it uses less digits than its factorization.

28730736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10534 (or 10525 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 28730736 is about 5360.1059691017. The cubic root of 28730736 is about 306.2778458090.

The spelling of 28730736 in words is "twenty-eight million, seven hundred thirty thousand, seven hundred thirty-six".