726581320 has 32 divisors (see below), whose sum is σ = 1672830720. Its totient is φ = 283872960.

The previous prime is 726581311. The next prime is 726581329. The reversal of 726581320 is 23185627.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (726581311) and next prime (726581329).

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (726581329) 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, 209496 + ... + 212935.

It is an arithmetic number, because the mean of its divisors is an integer number (52275960).

Almost surely, 2^726581320 is an apocalyptic number.

It is an amenable number.

726581320 is an abundant number, since it is smaller than the sum of its proper divisors (946249400).

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

726581320 is a wasteful number, since it uses less digits than its factorization.

726581320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422485 (or 422481 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 726581320 is about 26955.1724164399. The cubic root of 726581320 is about 899.0035556196.

The spelling of 726581320 in words is "seven hundred twenty-six million, five hundred eighty-one thousand, three hundred twenty".