721507676 has 12 divisors (see below), whose sum is σ = 1336911408. Its totient is φ = 339532992.

The previous prime is 721507673. The next prime is 721507697. The reversal of 721507676 is 676705127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721507673) 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, 5305136 + ... + 5305271.

It is an arithmetic number, because the mean of its divisors is an integer number (111409284).

Almost surely, 2^721507676 is an apocalyptic number.

It is an amenable number.

721507676 is a deficient number, since it is larger than the sum of its proper divisors (615403732).

721507676 is a wasteful number, since it uses less digits than its factorization.

721507676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610428 (or 10610426 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 41.

The square root of 721507676 is about 26860.8949218004. The cubic root of 721507676 is about 896.9061155922.

The spelling of 721507676 in words is "seven hundred twenty-one million, five hundred seven thousand, six hundred seventy-six".