84286640 has 20 divisors (see below), whose sum is σ = 195966624. Its totient is φ = 33714624.

The previous prime is 84286639. The next prime is 84286661. The reversal of 84286640 is 4668248.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 84286594 and 84286603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526712 + ... + 526871.

Almost surely, 2^84286640 is an apocalyptic number.

84286640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84286640 is an abundant number, since it is smaller than the sum of its proper divisors (111679984).

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

84286640 is a wasteful number, since it uses less digits than its factorization.

84286640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053596 (or 1053590 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 84286640 is about 9180.7755663669. The cubic root of 84286640 is about 438.4495013545.

The spelling of 84286640 in words is "eighty-four million, two hundred eighty-six thousand, six hundred forty".