763734721 has 4 divisors (see below), whose sum is σ = 772316100. Its totient is φ = 755153344.

The previous prime is 763734703. The next prime is 763734733. The reversal of 763734721 is 127437367.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127437367 = 443 ⋅287669.

It can be written as a sum of positive squares in 2 ways, for example, as 421891600 + 341843121 = 20540^2 + 18489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-763734721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (763734761) 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, 4290556 + ... + 4290733.

It is an arithmetic number, because the mean of its divisors is an integer number (193079025).

Almost surely, 2^763734721 is an apocalyptic number.

It is an amenable number.

763734721 is a deficient number, since it is larger than the sum of its proper divisors (8581379).

763734721 is an equidigital number, since it uses as much as digits as its factorization.

763734721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8581378.

The product of its digits is 148176, while the sum is 40.

The square root of 763734721 is about 27635.7507768470. The cubic root of 763734721 is about 914.0729244645.

The spelling of 763734721 in words is "seven hundred sixty-three million, seven hundred thirty-four thousand, seven hundred twenty-one".