721675650 has 24 divisors (see below), whose sum is σ = 1789755984. Its totient is φ = 192446800.

The previous prime is 721675631. The next prime is 721675657. The reversal of 721675650 is 56576127.

It is a junction number, because it is equal to n+sod(n) for n = 721675599 and 721675608.

It is not an unprimeable number, because it can be changed into a prime (721675657) 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 11 ways as a sum of consecutive naturals, for example, 2405436 + ... + 2405735.

It is an arithmetic number, because the mean of its divisors is an integer number (74573166).

Almost surely, 2^721675650 is an apocalyptic number.

721675650 is an abundant number, since it is smaller than the sum of its proper divisors (1068080334).

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

721675650 is a wasteful number, since it uses less digits than its factorization.

721675650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811186 (or 4811181 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 721675650 is about 26864.0214785501. The cubic root of 721675650 is about 896.9757130120.

The spelling of 721675650 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, six hundred fifty".