720321888 has 192 divisors, whose sum is σ = 2243469312. Its totient is φ = 199495680.

The previous prime is 720321851. The next prime is 720321911. The reversal of 720321888 is 888123027.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1880545 + ... + 1880927.

It is an arithmetic number, because the mean of its divisors is an integer number (11684736).

Almost surely, 2^720321888 is an apocalyptic number.

720321888 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720321888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1121734656).

720321888 is an abundant number, since it is smaller than the sum of its proper divisors (1523147424).

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

720321888 is a wasteful number, since it uses less digits than its factorization.

720321888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 720321888 is about 26838.8130885105. The cubic root of 720321888 is about 896.4144951909.

It can be divided in two parts, 72032 and 1888, that added together give a triangular number (73920 = T₃₈₄).

The spelling of 720321888 in words is "seven hundred twenty million, three hundred twenty-one thousand, eight hundred eighty-eight".