720755667 has 6 divisors (see below), whose sum is σ = 1041091532. Its totient is φ = 480503772.

The previous prime is 720755663. The next prime is 720755677. The reversal of 720755667 is 766557027.

It is not a de Polignac number, because 720755667 - 2² = 720755663 is a prime.

It is a super-2 number, since 2×720755667² = 1038977463025229778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720755663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40041973 + ... + 40041990.

Almost surely, 2^720755667 is an apocalyptic number.

720755667 is a deficient number, since it is larger than the sum of its proper divisors (320335865).

720755667 is a wasteful number, since it uses less digits than its factorization.

720755667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80083969 (or 80083966 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 45.

The square root of 720755667 is about 26846.8930604642. The cubic root of 720755667 is about 896.5943998332.

The spelling of 720755667 in words is "seven hundred twenty million, seven hundred fifty-five thousand, six hundred sixty-seven".