720290505 has 16 divisors (see below), whose sum is σ = 1257234624. Its totient is φ = 349231680.

The previous prime is 720290497. The next prime is 720290537. The reversal of 720290505 is 505092027.

It is a happy number.

It is not a de Polignac number, because 720290505 - 2³ = 720290497 is a prime.

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, 2182534 + ... + 2182863.

It is an arithmetic number, because the mean of its divisors is an integer number (78577164).

Almost surely, 2^720290505 is an apocalyptic number.

It is an amenable number.

720290505 is a deficient number, since it is larger than the sum of its proper divisors (536944119).

720290505 is a wasteful number, since it uses less digits than its factorization.

720290505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365416.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 720290505 is about 26838.2284251401. The cubic root of 720290505 is about 896.4014766663.

The spelling of 720290505 in words is "seven hundred twenty million, two hundred ninety thousand, five hundred five".