764233621 has 4 divisors (see below), whose sum is σ = 764365932. Its totient is φ = 764101312.

The previous prime is 764233619. The next prime is 764233649. The reversal of 764233621 is 126332467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126332467 = 37 ⋅3414391.

It can be written as a sum of positive squares in 2 ways, for example, as 293951025 + 470282596 = 17145^2 + 21686^2 .

It is a cyclic number.

It is not a de Polignac number, because 764233621 - 2¹ = 764233619 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 (764233601) 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, 57076 + ... + 69181.

It is an arithmetic number, because the mean of its divisors is an integer number (191091483).

Almost surely, 2^764233621 is an apocalyptic number.

It is an amenable number.

764233621 is a deficient number, since it is larger than the sum of its proper divisors (132311).

764233621 is a wasteful number, since it uses less digits than its factorization.

764233621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132310.

The product of its digits is 36288, while the sum is 34.

The square root of 764233621 is about 27644.7756547236. The cubic root of 764233621 is about 914.2719166479.

The spelling of 764233621 in words is "seven hundred sixty-four million, two hundred thirty-three thousand, six hundred twenty-one".