764198399 has 4 divisors (see below), whose sum is σ = 809151264. Its totient is φ = 719245536.

The previous prime is 764198377. The next prime is 764198417. The reversal of 764198399 is 993891467.

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

It is a cyclic number.

It is not a de Polignac number, because 764198399 - 2²⁰ = 763149823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764198339) 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, 22476407 + ... + 22476440.

It is an arithmetic number, because the mean of its divisors is an integer number (202287816).

Almost surely, 2^764198399 is an apocalyptic number.

764198399 is a deficient number, since it is larger than the sum of its proper divisors (44952865).

764198399 is a wasteful number, since it uses less digits than its factorization.

764198399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44952864.

The product of its digits is 2939328, while the sum is 56.

The square root of 764198399 is about 27644.1386011574. The cubic root of 764198399 is about 914.2578707771.

The spelling of 764198399 in words is "seven hundred sixty-four million, one hundred ninety-eight thousand, three hundred ninety-nine".