764987 has 4 divisors (see below), whose sum is σ = 789696. Its totient is φ = 740280.

The previous prime is 764977. The next prime is 764989. The reversal of 764987 is 789467.

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

It is not a de Polignac number, because 764987 - 2⁴ = 764971 is a prime.

It is a super-2 number, since 2×764987² = 1170410220338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764989) 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, 12308 + ... + 12369.

It is an arithmetic number, because the mean of its divisors is an integer number (197424).

2⁷⁶⁴⁹⁸⁷ is an apocalyptic number.

764987 is a deficient number, since it is larger than the sum of its proper divisors (24709).

764987 is a wasteful number, since it uses less digits than its factorization.

764987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24708.

The product of its digits is 84672, while the sum is 41.

The square root of 764987 is about 874.6353525899. The cubic root of 764987 is about 91.4572246735.

The spelling of 764987 in words is "seven hundred sixty-four thousand, nine hundred eighty-seven".