721334634 has 8 divisors (see below), whose sum is σ = 1442669280. Its totient is φ = 240444876.

The previous prime is 721334597. The next prime is 721334651. The reversal of 721334634 is 436433127.

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

721334634 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 721334595 and 721334604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60111214 + ... + 60111225.

It is an arithmetic number, because the mean of its divisors is an integer number (180333660).

Almost surely, 2^721334634 is an apocalyptic number.

721334634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

721334634 is a wasteful number, since it uses less digits than its factorization.

721334634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120222444.

The product of its digits is 36288, while the sum is 33.

The square root of 721334634 is about 26857.6736520496. The cubic root of 721334634 is about 896.8344070286.

It can be divided in two parts, 72133 and 4634, that added together give a palindrome (76767).

The spelling of 721334634 in words is "seven hundred twenty-one million, three hundred thirty-four thousand, six hundred thirty-four".