720507407 has 18 divisors (see below), whose sum is σ = 782708472. Its totient is φ = 661968384.

The previous prime is 720507377. The next prime is 720507409. The reversal of 720507407 is 704705027.

It is a happy number.

It is not a de Polignac number, because 720507407 - 2⁶ = 720507343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720507409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3733103 + ... + 3733295.

It is an arithmetic number, because the mean of its divisors is an integer number (43483804).

Almost surely, 2^720507407 is an apocalyptic number.

720507407 is a deficient number, since it is larger than the sum of its proper divisors (62201065).

720507407 is an equidigital number, since it uses as much as digits as its factorization.

720507407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 720507407 is about 26842.2690359813. The cubic root of 720507407 is about 896.4914458100.

The spelling of 720507407 in words is "seven hundred twenty million, five hundred seven thousand, four hundred seven".