91644679 has 4 divisors (see below), whose sum is σ = 104736784. Its totient is φ = 78552576.

The previous prime is 91644629. The next prime is 91644697. The reversal of 91644679 is 97644619.

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 91644679 - 2¹⁷ = 91513607 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 (91644629) 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, 6546042 + ... + 6546055.

It is an arithmetic number, because the mean of its divisors is an integer number (26184196).

Almost surely, 2^91644679 is an apocalyptic number.

91644679 is a deficient number, since it is larger than the sum of its proper divisors (13092105).

91644679 is a wasteful number, since it uses less digits than its factorization.

91644679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13092104.

The product of its digits is 326592, while the sum is 46.

The square root of 91644679 is about 9573.1227402557. The cubic root of 91644679 is about 450.8538176484.

The spelling of 91644679 in words is "ninety-one million, six hundred forty-four thousand, six hundred seventy-nine".