764421643 has 8 divisors (see below), whose sum is σ = 837298080. Its totient is φ = 694646400.

The previous prime is 764421613. The next prime is 764421649. The reversal of 764421643 is 346124467.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 764421643 - 2⁹ = 764421131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764421649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774783 + ... + 775768.

It is an arithmetic number, because the mean of its divisors is an integer number (104662260).

Almost surely, 2^764421643 is an apocalyptic number.

764421643 is a deficient number, since it is larger than the sum of its proper divisors (72876437).

764421643 is a wasteful number, since it uses less digits than its factorization.

764421643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550597.

The product of its digits is 96768, while the sum is 37.

The square root of 764421643 is about 27648.1761242943. The cubic root of 764421643 is about 914.3468889836.

The spelling of 764421643 in words is "seven hundred sixty-four million, four hundred twenty-one thousand, six hundred forty-three".