764644073 has 4 divisors (see below), whose sum is σ = 791011140. Its totient is φ = 738277008.

The previous prime is 764644009. The next prime is 764644117. The reversal of 764644073 is 370446467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 370446467 = 233 ⋅1589899.

It can be written as a sum of positive squares in 2 ways, for example, as 589664089 + 174979984 = 24283^2 + 13228^2 .

It is a cyclic number.

It is not a de Polignac number, because 764644073 - 2⁶ = 764644009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 764644073.

It is not an unprimeable number, because it can be changed into a prime (764674073) 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, 13183490 + ... + 13183547.

It is an arithmetic number, because the mean of its divisors is an integer number (197752785).

Almost surely, 2^764644073 is an apocalyptic number.

It is an amenable number.

764644073 is a deficient number, since it is larger than the sum of its proper divisors (26367067).

764644073 is a wasteful number, since it uses less digits than its factorization.

764644073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26367066.

The product of its (nonzero) digits is 338688, while the sum is 41.

The square root of 764644073 is about 27652.1983393726. The cubic root of 764644073 is about 914.4355653737.

The spelling of 764644073 in words is "seven hundred sixty-four million, six hundred forty-four thousand, seventy-three".