764988 has 36 divisors (see below), whose sum is σ = 2077992. Its totient is φ = 218400.

The previous prime is 764977. The next prime is 764989. The reversal of 764988 is 889467.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 764988.

It is not an unprimeable number, because it can be changed into a prime (764989) by changing a digit.

764988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63 + ... + 1238.

It is an arithmetic number, because the mean of its divisors is an integer number (57722).

2⁷⁶⁴⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 764988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038996).

764988 is an abundant number, since it is smaller than the sum of its proper divisors (1313004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

764988 is a wasteful number, since it uses less digits than its factorization.

764988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322 (or 1313 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 764988 is about 874.6359242565. The cubic root of 764988 is about 91.4572645248.

The spelling of 764988 in words is "seven hundred sixty-four thousand, nine hundred eighty-eight".