79887811 has 4 divisors (see below), whose sum is σ = 84587112. Its totient is φ = 75188512.

The previous prime is 79887793. The next prime is 79887823. The reversal of 79887811 is 11878897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11878897 = 1553 ⋅7649.

It is a cyclic number.

It is not a de Polignac number, because 79887811 - 2¹³ = 79879619 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79887611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2349625 + ... + 2349658.

It is an arithmetic number, because the mean of its divisors is an integer number (21146778).

Almost surely, 2^79887811 is an apocalyptic number.

79887811 is a deficient number, since it is larger than the sum of its proper divisors (4699301).

79887811 is a wasteful number, since it uses less digits than its factorization.

79887811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4699300.

The product of its digits is 225792, while the sum is 49.

The square root of 79887811 is about 8937.9981539492. The cubic root of 79887811 is about 430.6854238839.

The spelling of 79887811 in words is "seventy-nine million, eight hundred eighty-seven thousand, eight hundred eleven".