721481608 has 16 divisors (see below), whose sum is σ = 1354786380. Its totient is φ = 360205248.

The previous prime is 721481603. The next prime is 721481617. The reversal of 721481608 is 806184127.

It can be written as a sum of positive squares in 2 ways, for example, as 462336004 + 259145604 = 21502^2 + 16098^2 .

It is not an unprimeable number, because it can be changed into a prime (721481603) 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 3 ways as a sum of consecutive naturals, for example, 61191 + ... + 72022.

Almost surely, 2^721481608 is an apocalyptic number.

It is an amenable number.

721481608 is a deficient number, since it is larger than the sum of its proper divisors (633304772).

721481608 is a wasteful number, since it uses less digits than its factorization.

721481608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133896 (or 133892 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 721481608 is about 26860.4096766970. The cubic root of 721481608 is about 896.8953137528.

The spelling of 721481608 in words is "seven hundred twenty-one million, four hundred eighty-one thousand, six hundred eight".