84785732881 has 4 divisors (see below), whose sum is σ = 84790734064. Its totient is φ = 84780731700.

The previous prime is 84785732879. The next prime is 84785732887. The reversal of 84785732881 is 18823758748.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84785732881 - 2¹ = 84785732879 is a prime.

It is a super-2 number, since 2×84785732881² (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 (84785732887) 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, 2475075 + ... + 2509096.

It is an arithmetic number, because the mean of its divisors is an integer number (21197683516).

Almost surely, 2^84785732881 is an apocalyptic number.

It is an amenable number.

84785732881 is a deficient number, since it is larger than the sum of its proper divisors (5001183).

84785732881 is a wasteful number, since it uses less digits than its factorization.

84785732881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001182.

The product of its digits is 24084480, while the sum is 61.

The spelling of 84785732881 in words is "eighty-four billion, seven hundred eighty-five million, seven hundred thirty-two thousand, eight hundred eighty-one".