84671640 has 48 divisors (see below), whose sum is σ = 275184000. Its totient is φ = 22579008.

The previous prime is 84671627. The next prime is 84671659. The reversal of 84671640 is 4617648.

84671640 is a `hidden beast` number, since 8 + 4 + 6 + 7 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 84671595 and 84671604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117240 + ... + 117959.

It is an arithmetic number, because the mean of its divisors is an integer number (5733000).

Almost surely, 2^84671640 is an apocalyptic number.

It is an amenable number.

84671640 is an abundant number, since it is smaller than the sum of its proper divisors (190512360).

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

84671640 is a wasteful number, since it uses less digits than its factorization.

84671640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235216 (or 235209 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 84671640 is about 9201.7194045461. The cubic root of 84671640 is about 439.1160628710.

The spelling of 84671640 in words is "eighty-four million, six hundred seventy-one thousand, six hundred forty".