84806781 has 8 divisors (see below), whose sum is σ = 113770080. Its totient is φ = 56190672.

The previous prime is 84806741. The next prime is 84806783. The reversal of 84806781 is 18760848.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84806781 - 2¹⁰ = 84805757 is a prime.

It is a super-2 number, since 2×84806781² = 14384380207163922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84806783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86226 + ... + 87203.

It is an arithmetic number, because the mean of its divisors is an integer number (14221260).

Almost surely, 2^84806781 is an apocalyptic number.

It is an amenable number.

84806781 is a deficient number, since it is larger than the sum of its proper divisors (28963299).

84806781 is a wasteful number, since it uses less digits than its factorization.

84806781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173595.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 84806781 is about 9209.0597239892. The cubic root of 84806781 is about 439.3495571885.

The spelling of 84806781 in words is "eighty-four million, eight hundred six thousand, seven hundred eighty-one".