80128734 has 64 divisors (see below), whose sum is σ = 193121280. Its totient is φ = 21669120.

The previous prime is 80128729. The next prime is 80128751. The reversal of 80128734 is 43782108.

It is a super-2 number, since 2×80128734² = 12841228024885512, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 80128695 and 80128704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104914 + ... + 105674.

It is an arithmetic number, because the mean of its divisors is an integer number (3017520).

Almost surely, 2^80128734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80128734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96560640).

80128734 is an abundant number, since it is smaller than the sum of its proper divisors (112992546).

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

80128734 is a wasteful number, since it uses less digits than its factorization.

80128734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 80128734 is about 8951.4654666149. The cubic root of 80128734 is about 431.1179383068.

The spelling of 80128734 in words is "eighty million, one hundred twenty-eight thousand, seven hundred thirty-four".