721885338 has 16 divisors (see below), whose sum is σ = 1604189760. Its totient is φ = 240628428.

The previous prime is 721885321. The next prime is 721885343. The reversal of 721885338 is 833588127.

It is a super-2 number, since 2×721885338² = 1042236882438748488, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 721885293 and 721885302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6684070 + ... + 6684177.

It is an arithmetic number, because the mean of its divisors is an integer number (100261860).

Almost surely, 2^721885338 is an apocalyptic number.

721885338 is an abundant number, since it is smaller than the sum of its proper divisors (882304422).

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

721885338 is a wasteful number, since it uses less digits than its factorization.

721885338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13368258 (or 13368252 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 721885338 is about 26867.9239614824. The cubic root of 721885338 is about 897.0625788267.

The spelling of 721885338 in words is "seven hundred twenty-one million, eight hundred eighty-five thousand, three hundred thirty-eight".