84180977 has 4 divisors (see below), whose sum is σ = 84746100. Its totient is φ = 83615856.

The previous prime is 84180959. The next prime is 84180979. The reversal of 84180977 is 77908148.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4596736 + 79584241 = 2144^2 + 8921^2 .

It is a cyclic number.

It is not a de Polignac number, because 84180977 - 2⁸ = 84180721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84180979) 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, 282338 + ... + 282635.

It is an arithmetic number, because the mean of its divisors is an integer number (21186525).

Almost surely, 2^84180977 is an apocalyptic number.

It is an amenable number.

84180977 is a deficient number, since it is larger than the sum of its proper divisors (565123).

84180977 is a wasteful number, since it uses less digits than its factorization.

84180977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565122.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 84180977 is about 9175.0191825413. The cubic root of 84180977 is about 438.2662091100.

It can be divided in two parts, 841 and 80977, that added together give a palindrome (81818).

The spelling of 84180977 in words is "eighty-four million, one hundred eighty thousand, nine hundred seventy-seven".