764865481 has 4 divisors (see below), whose sum is σ = 765763012. Its totient is φ = 763967952.

The previous prime is 764865407. The next prime is 764865487. The reversal of 764865481 is 184568467.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119705481 + 645160000 = 10941^2 + 25400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764865481 is a prime.

It is a super-2 number, since 2×764865481² = 1170038408050722722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764865487) 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, 447486 + ... + 449191.

It is an arithmetic number, because the mean of its divisors is an integer number (191440753).

Almost surely, 2^764865481 is an apocalyptic number.

It is an amenable number.

764865481 is a deficient number, since it is larger than the sum of its proper divisors (897531).

764865481 is an equidigital number, since it uses as much as digits as its factorization.

764865481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897530.

The product of its digits is 1290240, while the sum is 49.

The square root of 764865481 is about 27656.2014926128. The cubic root of 764865481 is about 914.5238172451.

The spelling of 764865481 in words is "seven hundred sixty-four million, eight hundred sixty-five thousand, four hundred eighty-one".