91405684 has 12 divisors (see below), whose sum is σ = 162213408. Its totient is φ = 45059000.

The previous prime is 91405679. The next prime is 91405723. The reversal of 91405684 is 48650419.

It is a happy number.

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, 160642 + ... + 161209.

It is an arithmetic number, because the mean of its divisors is an integer number (13517784).

Almost surely, 2^91405684 is an apocalyptic number.

It is an amenable number.

91405684 is a deficient number, since it is larger than the sum of its proper divisors (70807724).

91405684 is a wasteful number, since it uses less digits than its factorization.

91405684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321926 (or 321924 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 91405684 is about 9560.6319874787. The cubic root of 91405684 is about 450.4615577016.

The spelling of 91405684 in words is "ninety-one million, four hundred five thousand, six hundred eighty-four".