80729220 has 144 divisors (see below), whose sum is σ = 268325568. Its totient is φ = 17879040.

The previous prime is 80729213. The next prime is 80729251. The reversal of 80729220 is 2292708.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 47 ways as a sum of consecutive naturals, for example, 832212 + ... + 832308.

It is an arithmetic number, because the mean of its divisors is an integer number (1863372).

Almost surely, 2^80729220 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 80729220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134162784).

80729220 is an abundant number, since it is smaller than the sum of its proper divisors (187596348).

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

80729220 is a wasteful number, since it uses less digits than its factorization.

80729220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 80729220 is about 8984.9440732817. The cubic root of 80729220 is about 432.1921941452.

The spelling of 80729220 in words is "eighty million, seven hundred twenty-nine thousand, two hundred twenty".