764720651 has 4 divisors (see below), whose sum is σ = 764859552. Its totient is φ = 764581752.

The previous prime is 764720611. The next prime is 764720657. The reversal of 764720651 is 156027467.

764720651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156027467 = 83 ⋅1879849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764720651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764720657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60836 + ... + 72321.

It is an arithmetic number, because the mean of its divisors is an integer number (191214888).

Almost surely, 2^764720651 is an apocalyptic number.

764720651 is a deficient number, since it is larger than the sum of its proper divisors (138901).

764720651 is a wasteful number, since it uses less digits than its factorization.

764720651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138900.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 764720651 is about 27653.5829685775. The cubic root of 764720651 is about 914.4660908219.

The spelling of 764720651 in words is "seven hundred sixty-four million, seven hundred twenty thousand, six hundred fifty-one".