721689414 has 16 divisors (see below), whose sum is σ = 1467041520. Its totient is φ = 236619360.

The previous prime is 721689413. The next prime is 721689481. The reversal of 721689414 is 414986127.

It is a super-2 number, since 2×721689414² = 1041671220559326792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721689413) 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, 985549 + ... + 986280.

It is an arithmetic number, because the mean of its divisors is an integer number (91690095).

Almost surely, 2^721689414 is an apocalyptic number.

721689414 is an abundant number, since it is smaller than the sum of its proper divisors (745352106).

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

721689414 is a wasteful number, since it uses less digits than its factorization.

721689414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971895.

The product of its digits is 96768, while the sum is 42.

The square root of 721689414 is about 26864.2776563972. The cubic root of 721689414 is about 896.9814154331.

The spelling of 721689414 in words is "seven hundred twenty-one million, six hundred eighty-nine thousand, four hundred fourteen".