28734029720 has 192 divisors, whose sum is σ = 74462976000. Its totient is φ = 9952743680.

The previous prime is 28734029693. The next prime is 28734029729. The reversal of 28734029720 is 2792043782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28734029729) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39963521 + ... + 39964239.

It is an arithmetic number, because the mean of its divisors is an integer number (387828000).

Almost surely, 2^28734029720 is an apocalyptic number.

28734029720 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 28734029720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37231488000).

28734029720 is an abundant number, since it is smaller than the sum of its proper divisors (45728946280).

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

28734029720 is a wasteful number, since it uses less digits than its factorization.

28734029720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 28734029720 in words is "twenty-eight billion, seven hundred thirty-four million, twenty-nine thousand, seven hundred twenty".