84486978 has 48 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 27303360.

The previous prime is 84486973. The next prime is 84486979. The reversal of 84486978 is 87968448.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84486971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176143 + ... + 176621.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^84486978 is an apocalyptic number.

84486978 is an abundant number, since it is smaller than the sum of its proper divisors (104210622).

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

84486978 is a wasteful number, since it uses less digits than its factorization.

84486978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 764 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 84486978 is about 9191.6798247110. The cubic root of 84486978 is about 438.7966049795.

The spelling of 84486978 in words is "eighty-four million, four hundred eighty-six thousand, nine hundred seventy-eight".