721198080 has 440 divisors, whose sum is σ = 2710686528. Its totient is φ = 183140352.

The previous prime is 721198063. The next prime is 721198087. The reversal of 721198080 is 80891127.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721198087) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 15344617 + ... + 15344663.

Almost surely, 2^721198080 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 721198080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1355343264).

721198080 is an abundant number, since it is smaller than the sum of its proper divisors (1989488448).

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

721198080 is a wasteful number, since it uses less digits than its factorization.

721198080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 721198080 is about 26855.1313532442. The cubic root of 721198080 is about 896.7778109872. Note that the first 3 decimals are identical.

The spelling of 721198080 in words is "seven hundred twenty-one million, one hundred ninety-eight thousand, eighty".