721020369 has 8 divisors (see below), whose sum is σ = 987343360. Its totient is φ = 467688816.

The previous prime is 721020367. The next prime is 721020409. The reversal of 721020369 is 963020127.

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

It is not a de Polignac number, because 721020369 - 2¹ = 721020367 is a prime.

It is a super-2 number, since 2×721020369² = 1039740745025792322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721020367) 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, 3247729 + ... + 3247950.

It is an arithmetic number, because the mean of its divisors is an integer number (123417920).

Almost surely, 2^721020369 is an apocalyptic number.

It is an amenable number.

721020369 is a deficient number, since it is larger than the sum of its proper divisors (266322991).

721020369 is a wasteful number, since it uses less digits than its factorization.

721020369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495719.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 721020369 is about 26851.8224521167. The cubic root of 721020369 is about 896.7041463553.

The spelling of 721020369 in words is "seven hundred twenty-one million, twenty thousand, three hundred sixty-nine".