720720045 has 16 divisors (see below), whose sum is σ = 1281280320. Its totient is φ = 384383952.

The previous prime is 720720037. The next prime is 720720059. The reversal of 720720045 is 540027027.

It is not a de Polignac number, because 720720045 - 2³ = 720720037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2669199 + ... + 2669468.

It is an arithmetic number, because the mean of its divisors is an integer number (80080020).

Almost surely, 2^720720045 is an apocalyptic number.

It is an amenable number.

720720045 is a deficient number, since it is larger than the sum of its proper divisors (560560275).

720720045 is a wasteful number, since it uses less digits than its factorization.

720720045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338681 (or 5338675 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 720720045 is about 26846.2296235430. The cubic root of 720720045 is about 896.5796287565.

The spelling of 720720045 in words is "seven hundred twenty million, seven hundred twenty thousand, forty-five".