723697920 has 216 divisors, whose sum is σ = 2732026752. Its totient is φ = 175411200.

The previous prime is 723697913. The next prime is 723697951. The reversal of 723697920 is 29796327.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123865 + ... + 129575.

It is an arithmetic number, because the mean of its divisors is an integer number (12648272).

Almost surely, 2^723697920 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 723697920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1366013376).

723697920 is an abundant number, since it is smaller than the sum of its proper divisors (2008328832).

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

723697920 is a wasteful number, since it uses less digits than its factorization.

723697920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749 (or 5732 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 723697920 is about 26901.6341511069. The cubic root of 723697920 is about 897.8127628174.

The spelling of 723697920 in words is "seven hundred twenty-three million, six hundred ninety-seven thousand, nine hundred twenty".