731221080 has 128 divisors (see below), whose sum is σ = 2388960000. Its totient is φ = 178343424.

The previous prime is 731221069. The next prime is 731221081. The reversal of 731221080 is 80122137.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 731221080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731221081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60591 + ... + 71649.

It is an arithmetic number, because the mean of its divisors is an integer number (18663750).

Almost surely, 2^731221080 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 731221080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1194480000).

731221080 is an abundant number, since it is smaller than the sum of its proper divisors (1657738920).

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

731221080 is a wasteful number, since it uses less digits than its factorization.

731221080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11121 (or 11117 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 731221080 is about 27041.0998297037. The cubic root of 731221080 is about 900.9130979915.

The spelling of 731221080 in words is "seven hundred thirty-one million, two hundred twenty-one thousand, eighty".