84517980 has 24 divisors (see below), whose sum is σ = 236650512. Its totient is φ = 22538112.

The previous prime is 84517969. The next prime is 84517991. The reversal of 84517980 is 8971548.

It is an interprime number because it is at equal distance from previous prime (84517969) and next prime (84517991).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704257 + ... + 704376.

It is an arithmetic number, because the mean of its divisors is an integer number (9860438).

Almost surely, 2^84517980 is an apocalyptic number.

It is an amenable number.

84517980 is an abundant number, since it is smaller than the sum of its proper divisors (152132532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84517980 is a wasteful number, since it uses less digits than its factorization.

84517980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408645 (or 1408643 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 84517980 is about 9193.3660864778. The cubic root of 84517980 is about 438.8502696944.

The spelling of 84517980 in words is "eighty-four million, five hundred seventeen thousand, nine hundred eighty".