84679991 has 8 divisors (see below), whose sum is σ = 92968464. Its totient is φ = 76489920.

The previous prime is 84679981. The next prime is 84679993. The reversal of 84679991 is 19997648.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 84679991 - 2²² = 80485687 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 (84679993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22790 + ... + 26243.

It is an arithmetic number, because the mean of its divisors is an integer number (11621058).

Almost surely, 2^84679991 is an apocalyptic number.

84679991 is a deficient number, since it is larger than the sum of its proper divisors (8288473).

84679991 is a wasteful number, since it uses less digits than its factorization.

84679991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49201.

The product of its digits is 979776, while the sum is 53.

The square root of 84679991 is about 9202.1731672470. The cubic root of 84679991 is about 439.1304987856.

The spelling of 84679991 in words is "eighty-four million, six hundred seventy-nine thousand, nine hundred ninety-one".