79840561 has 8 divisors (see below), whose sum is σ = 82200384. Its totient is φ = 77491440.

The previous prime is 79840549. The next prime is 79840573. The reversal of 79840561 is 16504897.

It is an interprime number because it is at equal distance from previous prime (79840549) and next prime (79840573).

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 79840561 - 2⁹ = 79840049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79840361) 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, 13956 + ... + 18826.

It is an arithmetic number, because the mean of its divisors is an integer number (10275048).

Almost surely, 2^79840561 is an apocalyptic number.

It is an amenable number.

79840561 is a deficient number, since it is larger than the sum of its proper divisors (2359823).

79840561 is a wasteful number, since it uses less digits than its factorization.

79840561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 79840561 is about 8935.3545536817. The cubic root of 79840561 is about 430.6004968704.

The spelling of 79840561 in words is "seventy-nine million, eight hundred forty thousand, five hundred sixty-one".