721362730 has 32 divisors (see below), whose sum is σ = 1454785920. Its totient is φ = 255222720.

The previous prime is 721362727. The next prime is 721362737. The reversal of 721362730 is 37263127.

It is a junction number, because it is equal to n+sod(n) for n = 721362692 and 721362701.

It is not an unprimeable number, because it can be changed into a prime (721362737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84550 + ... + 92689.

It is an arithmetic number, because the mean of its divisors is an integer number (45462060).

Almost surely, 2^721362730 is an apocalyptic number.

721362730 is an abundant number, since it is smaller than the sum of its proper divisors (733423190).

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

721362730 is a wasteful number, since it uses less digits than its factorization.

721362730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177294.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 721362730 is about 26858.1967004488. The cubic root of 721362730 is about 896.8460507841.

The spelling of 721362730 in words is "seven hundred twenty-one million, three hundred sixty-two thousand, seven hundred thirty".