721761064 has 32 divisors (see below), whose sum is σ = 1373011200. Its totient is φ = 355642560.

The previous prime is 721761059. The next prime is 721761083. The reversal of 721761064 is 460167127.

It is a happy number.

It is a super-3 number, since 3×721761064³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610554 + ... + 611734.

It is an arithmetic number, because the mean of its divisors is an integer number (42906600).

Almost surely, 2^721761064 is an apocalyptic number.

It is an amenable number.

721761064 is a deficient number, since it is larger than the sum of its proper divisors (651250136).

721761064 is a wasteful number, since it uses less digits than its factorization.

721761064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233 (or 2229 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 721761064 is about 26865.6111786053. The cubic root of 721761064 is about 897.0110988354.

The spelling of 721761064 in words is "seven hundred twenty-one million, seven hundred sixty-one thousand, sixty-four".