721966380 has 24 divisors (see below), whose sum is σ = 2021506032. Its totient is φ = 192524352.

The previous prime is 721966369. The next prime is 721966381. The reversal of 721966380 is 83669127.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (721966381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6016327 + ... + 6016446.

It is an arithmetic number, because the mean of its divisors is an integer number (84229418).

Almost surely, 2^721966380 is an apocalyptic number.

It is an amenable number.

721966380 is an abundant number, since it is smaller than the sum of its proper divisors (1299539652).

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

721966380 is a wasteful number, since it uses less digits than its factorization.

721966380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12032785 (or 12032783 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 721966380 is about 26869.4320743852. The cubic root of 721966380 is about 897.0961469579.

The spelling of 721966380 in words is "seven hundred twenty-one million, nine hundred sixty-six thousand, three hundred eighty".