28706389632 has 160 divisors (see below), whose sum is σ = 85618922400. Its totient is φ = 9547614720.

The previous prime is 28706389603. The next prime is 28706389661. The reversal of 28706389632 is 23698360782.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28706389603) and next prime (28706389661).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5087869 + ... + 5093507.

It is an arithmetic number, because the mean of its divisors is an integer number (535118265).

Almost surely, 2^28706389632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28706389632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42809461200).

28706389632 is an abundant number, since it is smaller than the sum of its proper divisors (56912532768).

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

28706389632 is an equidigital number, since it uses as much as digits as its factorization.

28706389632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156 (or 6135 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 28706389632 in words is "twenty-eight billion, seven hundred six million, three hundred eighty-nine thousand, six hundred thirty-two".