28734720 has 144 divisors (see below), whose sum is σ = 104979840. Its totient is φ = 6561792.

The previous prime is 28734703. The next prime is 28734733. The reversal of 28734720 is 2743782.

It is a super-3 number, since 3×28734720³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26346 + ... + 27414.

Almost surely, 2^28734720 is an apocalyptic number.

28734720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28734720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52489920).

28734720 is an abundant number, since it is smaller than the sum of its proper divisors (76245120).

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

28734720 is a wasteful number, since it uses less digits than its factorization.

28734720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 28734720 is about 5360.4775906630. The cubic root of 28734720 is about 306.2920020137.

The spelling of 28734720 in words is "twenty-eight million, seven hundred thirty-four thousand, seven hundred twenty".