720919667 has 4 divisors (see below), whose sum is σ = 776375040. Its totient is φ = 665464296.

The previous prime is 720919651. The next prime is 720919673. The reversal of 720919667 is 766919027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766919027 = 7 ⋅109559861.

It is a cyclic number.

It is not a de Polignac number, because 720919667 - 2⁴ = 720919651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720919607) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27727667 + ... + 27727692.

It is an arithmetic number, because the mean of its divisors is an integer number (194093760).

Almost surely, 2^720919667 is an apocalyptic number.

720919667 is a deficient number, since it is larger than the sum of its proper divisors (55455373).

720919667 is a wasteful number, since it uses less digits than its factorization.

720919667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55455372.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 720919667 is about 26849.9472438960. The cubic root of 720919667 is about 896.6623980640.

The spelling of 720919667 in words is "seven hundred twenty million, nine hundred nineteen thousand, six hundred sixty-seven".