720421968 has 160 divisors (see below), whose sum is σ = 2203858944. Its totient is φ = 198498816.

The previous prime is 720421967. The next prime is 720421979. The reversal of 720421968 is 869124027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720421967) 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, 2075971 + ... + 2076317.

Almost surely, 2^720421968 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 720421968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101929472).

720421968 is an abundant number, since it is smaller than the sum of its proper divisors (1483436976).

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

720421968 is a wasteful number, since it uses less digits than its factorization.

720421968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 720421968 is about 26840.6774877237. The cubic root of 720421968 is about 896.4560085799.

The spelling of 720421968 in words is "seven hundred twenty million, four hundred twenty-one thousand, nine hundred sixty-eight".