84020287 has 4 divisors (see below), whose sum is σ = 90483400. Its totient is φ = 77557176.

The previous prime is 84020281. The next prime is 84020291. The reversal of 84020287 is 78202048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84020287 - 2⁷ = 84020159 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 (84020281) 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, 3231537 + ... + 3231562.

It is an arithmetic number, because the mean of its divisors is an integer number (22620850).

Almost surely, 2^84020287 is an apocalyptic number.

84020287 is a deficient number, since it is larger than the sum of its proper divisors (6463113).

84020287 is a wasteful number, since it uses less digits than its factorization.

84020287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6463112.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 84020287 is about 9166.2580696814. The cubic root of 84020287 is about 437.9871680178.

The spelling of 84020287 in words is "eighty-four million, twenty thousand, two hundred eighty-seven".