721047069 has 16 divisors (see below), whose sum is σ = 1090947840. Its totient is φ = 470469600.

The previous prime is 721047059. The next prime is 721047127. The reversal of 721047069 is 960740127.

It is a happy number.

It is not a de Polignac number, because 721047069 - 2¹⁶ = 720981533 is a prime.

It is a super-2 number, since 2×721047069² = 1039817751426981522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721047059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282832 + ... + 285369.

It is an arithmetic number, because the mean of its divisors is an integer number (68184240).

Almost surely, 2^721047069 is an apocalyptic number.

It is an amenable number.

721047069 is a deficient number, since it is larger than the sum of its proper divisors (369900771).

721047069 is a wasteful number, since it uses less digits than its factorization.

721047069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568257 (or 568251 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 721047069 is about 26852.3196204723. The cubic root of 721047069 is about 896.7152147921.

The spelling of 721047069 in words is "seven hundred twenty-one million, forty-seven thousand, sixty-nine".