84021680 has 40 divisors (see below), whose sum is σ = 195737472. Its totient is φ = 33542144.

The previous prime is 84021673. The next prime is 84021683. The reversal of 84021680 is 8612048.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (84021683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68432 + ... + 69648.

Almost surely, 2^84021680 is an apocalyptic number.

84021680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84021680 is an abundant number, since it is smaller than the sum of its proper divisors (111715792).

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

84021680 is a wasteful number, since it uses less digits than its factorization.

84021680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093 (or 2087 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 84021680 is about 9166.3340545717. The cubic root of 84021680 is about 437.9895885156.

The spelling of 84021680 in words is "eighty-four million, twenty-one thousand, six hundred eighty".