721289445 has 8 divisors (see below), whose sum is σ = 1154063136. Its totient is φ = 384687696.

The previous prime is 721289423. The next prime is 721289467. The reversal of 721289445 is 544982127.

721289445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (721289423) and next prime (721289467).

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

It is not a de Polignac number, because 721289445 - 2¹² = 721285349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721289397 and 721289406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24042967 + ... + 24042996.

It is an arithmetic number, because the mean of its divisors is an integer number (144257892).

Almost surely, 2^721289445 is an apocalyptic number.

It is an amenable number.

721289445 is a deficient number, since it is larger than the sum of its proper divisors (432773691).

721289445 is a wasteful number, since it uses less digits than its factorization.

721289445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48085971.

The product of its digits is 161280, while the sum is 42.

The square root of 721289445 is about 26856.8323709257. The cubic root of 721289445 is about 896.8156788293.

The spelling of 721289445 in words is "seven hundred twenty-one million, two hundred eighty-nine thousand, four hundred forty-five".