721435066 has 32 divisors (see below), whose sum is σ = 1239556608. Its totient is φ = 311707440.

The previous prime is 721435063. The next prime is 721435081. The reversal of 721435066 is 660534127.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (721435061) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 78105 + ... + 86851.

It is an arithmetic number, because the mean of its divisors is an integer number (38736144).

Almost surely, 2^721435066 is an apocalyptic number.

721435066 is a deficient number, since it is larger than the sum of its proper divisors (518121542).

721435066 is a wasteful number, since it uses less digits than its factorization.

721435066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8946.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 721435066 is about 26859.5432947025. The cubic root of 721435066 is about 896.8760274218.

The spelling of 721435066 in words is "seven hundred twenty-one million, four hundred thirty-five thousand, sixty-six".