84878077331 has 4 divisors (see below), whose sum is σ = 84887783112. Its totient is φ = 84868371552.

The previous prime is 84878077289. The next prime is 84878077387. The reversal of 84878077331 is 13377087848.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84878077331 - 2¹⁴ = 84878060947 is a prime.

It is a super-2 number, since 2×84878077331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84878077231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4839761 + ... + 4857266.

It is an arithmetic number, because the mean of its divisors is an integer number (21221945778).

Almost surely, 2^84878077331 is an apocalyptic number.

84878077331 is a deficient number, since it is larger than the sum of its proper divisors (9705781).

84878077331 is an equidigital number, since it uses as much as digits as its factorization.

84878077331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9705780.

The product of its (nonzero) digits is 6322176, while the sum is 56.

The spelling of 84878077331 in words is "eighty-four billion, eight hundred seventy-eight million, seventy-seven thousand, three hundred thirty-one".