84991679 has 4 divisors (see below), whose sum is σ = 85025784. Its totient is φ = 84957576.

The previous prime is 84991661. The next prime is 84991681. The reversal of 84991679 is 97619948.

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 84991679 - 2¹² = 84987583 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6 and base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 84991679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84991639) 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, 12992 + ... + 18405.

It is an arithmetic number, because the mean of its divisors is an integer number (21256446).

Almost surely, 2^84991679 is an apocalyptic number.

84991679 is a deficient number, since it is larger than the sum of its proper divisors (34105).

84991679 is a wasteful number, since it uses less digits than its factorization.

84991679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34104.

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

The square root of 84991679 is about 9219.0931766633. The cubic root of 84991679 is about 439.6686192889.

The spelling of 84991679 in words is "eighty-four million, nine hundred ninety-one thousand, six hundred seventy-nine".