721434616 has 32 divisors (see below), whose sum is σ = 1547274240. Its totient is φ = 308917728.

The previous prime is 721434613. The next prime is 721434643. The reversal of 721434616 is 616434127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721434611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68025 + ... + 77911.

It is an arithmetic number, because the mean of its divisors is an integer number (48352320).

Almost surely, 2^721434616 is an apocalyptic number.

It is an amenable number.

721434616 is an abundant number, since it is smaller than the sum of its proper divisors (825839624).

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

721434616 is a wasteful number, since it uses less digits than its factorization.

721434616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11203 (or 11199 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 721434616 is about 26859.5349177904. The cubic root of 721434616 is about 896.8758409442.

The spelling of 721434616 in words is "seven hundred twenty-one million, four hundred thirty-four thousand, six hundred sixteen".