84028621 has 16 divisors (see below), whose sum is σ = 91641600. Its totient is φ = 76785408.

The previous prime is 84028601. The next prime is 84028627. The reversal of 84028621 is 12682048.

It is a cyclic number.

It is not a de Polignac number, because 84028621 - 2¹¹ = 84026573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84028627) 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 15 ways as a sum of consecutive naturals, for example, 64545 + ... + 65833.

It is an arithmetic number, because the mean of its divisors is an integer number (5727600).

Almost surely, 2^84028621 is an apocalyptic number.

It is an amenable number.

84028621 is a deficient number, since it is larger than the sum of its proper divisors (7612979).

84028621 is a wasteful number, since it uses less digits than its factorization.

84028621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 84028621 is about 9166.7126604907. The cubic root of 84028621 is about 438.0016489030.

The spelling of 84028621 in words is "eighty-four million, twenty-eight thousand, six hundred twenty-one".