84328991 has 4 divisors (see below), whose sum is σ = 84691152. Its totient is φ = 83966832.

The previous prime is 84328963. The next prime is 84328997. The reversal of 84328991 is 19982348.

It is a happy number.

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 84328991 - 2⁶ = 84328927 is a prime.

It is a super-2 number, since 2×84328991² = 14222757446156162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84328997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180731 + ... + 181196.

It is an arithmetic number, because the mean of its divisors is an integer number (21172788).

Almost surely, 2^84328991 is an apocalyptic number.

84328991 is a deficient number, since it is larger than the sum of its proper divisors (362161).

84328991 is a wasteful number, since it uses less digits than its factorization.

84328991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362160.

The product of its digits is 124416, while the sum is 44.

The square root of 84328991 is about 9183.0817811887. The cubic root of 84328991 is about 438.5229240846.

The spelling of 84328991 in words is "eighty-four million, three hundred twenty-eight thousand, nine hundred ninety-one".