721763064 has 72 divisors (see below), whose sum is σ = 2148662880. Its totient is φ = 218713440.

The previous prime is 721763059. The next prime is 721763083. The reversal of 721763064 is 460367127.

721763064 is a `hidden beast` number, since 7 + 2 + 17 + 630 + 6 + 4 = 666.

721763064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 32712 + ... + 50135.

It is an arithmetic number, because the mean of its divisors is an integer number (29842540).

Almost surely, 2^721763064 is an apocalyptic number.

It is an amenable number.

721763064 is an abundant number, since it is smaller than the sum of its proper divisors (1426899816).

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

721763064 is a wasteful number, since it uses less digits than its factorization.

721763064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82881 (or 82863 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 721763064 is about 26865.6484008855. The cubic root of 721763064 is about 897.0119273739.

The spelling of 721763064 in words is "seven hundred twenty-one million, seven hundred sixty-three thousand, sixty-four".