721711734 has 16 divisors (see below), whose sum is σ = 1463754240. Its totient is φ = 237182120.

The previous prime is 721711723. The next prime is 721711741. The reversal of 721711734 is 437117127.

It is a junction number, because it is equal to n+sod(n) for n = 721711695 and 721711704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846654 + ... + 847505.

It is an arithmetic number, because the mean of its divisors is an integer number (91484640).

Almost surely, 2^721711734 is an apocalyptic number.

721711734 is an abundant number, since it is smaller than the sum of its proper divisors (742042506).

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

721711734 is a wasteful number, since it uses less digits than its factorization.

721711734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694235.

The product of its digits is 8232, while the sum is 33.

The square root of 721711734 is about 26864.6930747403. The cubic root of 721711734 is about 896.9906624482.

The spelling of 721711734 in words is "seven hundred twenty-one million, seven hundred eleven thousand, seven hundred thirty-four".