91347644 has 12 divisors (see below), whose sum is σ = 159933144. Its totient is φ = 45652464.

The previous prime is 91347637. The next prime is 91347653. The reversal of 91347644 is 44674319.

It is a junction number, because it is equal to n+sod(n) for n = 91347598 and 91347607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7967 + ... + 15689.

It is an arithmetic number, because the mean of its divisors is an integer number (13327762).

Almost surely, 2^91347644 is an apocalyptic number.

It is an amenable number.

91347644 is a deficient number, since it is larger than the sum of its proper divisors (68585500).

91347644 is a wasteful number, since it uses less digits than its factorization.

91347644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10684 (or 10682 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 91347644 is about 9557.5961412899. The cubic root of 91347644 is about 450.3661941044.

The spelling of 91347644 in words is "ninety-one million, three hundred forty-seven thousand, six hundred forty-four".