84220644 has 12 divisors (see below), whose sum is σ = 196514864. Its totient is φ = 28073544.

The previous prime is 84220639. The next prime is 84220649. The reversal of 84220644 is 44602248.

It is an interprime number because it is at equal distance from previous prime (84220639) and next prime (84220649).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (84220649) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3509182 + ... + 3509205.

Almost surely, 2^84220644 is an apocalyptic number.

It is an amenable number.

84220644 is an abundant number, since it is smaller than the sum of its proper divisors (112294220).

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

84220644 is a wasteful number, since it uses less digits than its factorization.

84220644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7018394 (or 7018392 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

The square root of 84220644 is about 9177.1806128026. The cubic root of 84220644 is about 438.3350369158.

The spelling of 84220644 in words is "eighty-four million, two hundred twenty thousand, six hundred forty-four".