721548066 has 16 divisors (see below), whose sum is σ = 1519048800. Its totient is φ = 227857248.

The previous prime is 721548029. The next prime is 721548071. The reversal of 721548066 is 660845127.

It is a super-2 number, since 2×721548066² = 1041263223096680712, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3164571 + ... + 3164798.

It is an arithmetic number, because the mean of its divisors is an integer number (94940550).

Almost surely, 2^721548066 is an apocalyptic number.

721548066 is an abundant number, since it is smaller than the sum of its proper divisors (797500734).

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

721548066 is a wasteful number, since it uses less digits than its factorization.

721548066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6329393.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 721548066 is about 26861.6467477331. The cubic root of 721548066 is about 896.9228515482.

The spelling of 721548066 in words is "seven hundred twenty-one million, five hundred forty-eight thousand, sixty-six".