70720561 has 8 divisors (see below), whose sum is σ = 78136704. Its totient is φ = 63666240.

The previous prime is 70720549. The next prime is 70720597. The reversal of 70720561 is 16502707.

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 70720561 - 2⁹ = 70720049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70720511) 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, 90045 + ... + 90826.

It is an arithmetic number, because the mean of its divisors is an integer number (9767088).

Almost surely, 2^70720561 is an apocalyptic number.

It is an amenable number.

70720561 is a deficient number, since it is larger than the sum of its proper divisors (7416143).

70720561 is a wasteful number, since it uses less digits than its factorization.

70720561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180911.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 70720561 is about 8409.5517716463. The cubic root of 70720561 is about 413.5378184495.

The spelling of 70720561 in words is "seventy million, seven hundred twenty thousand, five hundred sixty-one".