721629089 has 8 divisors (see below), whose sum is σ = 728474208. Its totient is φ = 714804480.

The previous prime is 721629047. The next prime is 721629109. The reversal of 721629089 is 980926127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721629089 - 2⁸ = 721628833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721629289) 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, 70814 + ... + 80360.

It is an arithmetic number, because the mean of its divisors is an integer number (91059276).

Almost surely, 2^721629089 is an apocalyptic number.

It is an amenable number.

721629089 is a deficient number, since it is larger than the sum of its proper divisors (6845119).

721629089 is a wasteful number, since it uses less digits than its factorization.

721629089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 721629089 is about 26863.1548593980. The cubic root of 721629089 is about 896.9564222663.

The spelling of 721629089 in words is "seven hundred twenty-one million, six hundred twenty-nine thousand, eighty-nine".