70720321 has 8 divisors (see below), whose sum is σ = 81320384. Its totient is φ = 60244560.

The previous prime is 70720303. The next prime is 70720333. The reversal of 70720321 is 12302707.

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 70720321 - 2²³ = 62331713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70720292 and 70720301.

It is not an unprimeable number, because it can be changed into a prime (70720361) 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, 29850 + ... + 32131.

It is an arithmetic number, because the mean of its divisors is an integer number (10165048).

Almost surely, 2^70720321 is an apocalyptic number.

It is an amenable number.

70720321 is a deficient number, since it is larger than the sum of its proper divisors (10600063).

70720321 is a wasteful number, since it uses less digits than its factorization.

70720321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62151.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 70720321 is about 8409.5375021460. The cubic root of 70720321 is about 413.5373506497.

The spelling of 70720321 in words is "seventy million, seven hundred twenty thousand, three hundred twenty-one".