764681 has 4 divisors (see below), whose sum is σ = 797952. Its totient is φ = 731412.

The previous prime is 764657. The next prime is 764683. The reversal of 764681 is 186467.

764681 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186467 = 263 ⋅709.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764681 is a prime.

It is a super-2 number, since 2×764681² = 1169474063522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764683) 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, 16601 + ... + 16646.

It is an arithmetic number, because the mean of its divisors is an integer number (199488).

2⁷⁶⁴⁶⁸¹ is an apocalyptic number.

It is an amenable number.

764681 is a deficient number, since it is larger than the sum of its proper divisors (33271).

764681 is a wasteful number, since it uses less digits than its factorization.

764681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33270.

The product of its digits is 8064, while the sum is 32.

The square root of 764681 is about 874.4604050499. The cubic root of 764681 is about 91.4450285433.

The spelling of 764681 in words is "seven hundred sixty-four thousand, six hundred eighty-one".