720739530 has 72 divisors (see below), whose sum is σ = 2179882692. Its totient is φ = 164739456.

The previous prime is 720739519. The next prime is 720739549. The reversal of 720739530 is 35937027.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 679175721 + 41563809 = 26061^2 + 6447^2 .

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 35 ways as a sum of consecutive naturals, for example, 77307 + ... + 86126.

Almost surely, 2^720739530 is an apocalyptic number.

720739530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

720739530 is an abundant number, since it is smaller than the sum of its proper divisors (1459143162).

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

720739530 is a wasteful number, since it uses less digits than its factorization.

720739530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163460 (or 163450 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 36.

The square root of 720739530 is about 26846.5925212121. The cubic root of 720739530 is about 896.5877084987.

The spelling of 720739530 in words is "seven hundred twenty million, seven hundred thirty-nine thousand, five hundred thirty".