764388 has 36 divisors (see below), whose sum is σ = 2047500. Its totient is φ = 239616.

The previous prime is 764381. The next prime is 764399. The reversal of 764388 is 883467.

764388 is a `hidden beast` number, since 7 + 643 + 8 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 459684 + 304704 = 678^2 + 552^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 764388.

It is not an unprimeable number, because it can be changed into a prime (764381) by changing a digit.

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, 13 + ... + 1236.

It is an arithmetic number, because the mean of its divisors is an integer number (56875).

2⁷⁶⁴³⁸⁸ 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 764388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023750).

764388 is an abundant number, since it is smaller than the sum of its proper divisors (1283112).

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

764388 is a wasteful number, since it uses less digits than its factorization.

764388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276 (or 1271 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 764388 is about 874.2928571137. The cubic root of 764388 is about 91.4333474998.

The spelling of 764388 in words is "seven hundred sixty-four thousand, three hundred eighty-eight".