84784321 has 8 divisors (see below), whose sum is σ = 90240264. Its totient is φ = 79380480.

The previous prime is 84784309. The next prime is 84784331. The reversal of 84784321 is 12348748.

It can be written as a sum of positive squares in 4 ways, for example, as 6656400 + 78127921 = 2580^2 + 8839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84784321 - 2¹³ = 84776129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84784331) 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, 9640 + ... + 16201.

It is an arithmetic number, because the mean of its divisors is an integer number (11280033).

Almost surely, 2^84784321 is an apocalyptic number.

It is an amenable number.

84784321 is a deficient number, since it is larger than the sum of its proper divisors (5455943).

84784321 is a wasteful number, since it uses less digits than its factorization.

84784321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26051.

The product of its digits is 43008, while the sum is 37.

The square root of 84784321 is about 9207.8401919234. The cubic root of 84784321 is about 439.3107683786.

The spelling of 84784321 in words is "eighty-four million, seven hundred eighty-four thousand, three hundred twenty-one".