91906788 has 12 divisors (see below), whose sum is σ = 214449200. Its totient is φ = 30635592.

The previous prime is 91906753. The next prime is 91906807. The reversal of 91906788 is 88760919.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3829438 + ... + 3829461.

Almost surely, 2^91906788 is an apocalyptic number.

It is an amenable number.

91906788 is an abundant number, since it is smaller than the sum of its proper divisors (122542412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91906788 is a wasteful number, since it uses less digits than its factorization.

91906788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7658906 (or 7658904 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 91906788 is about 9586.8028038549. The cubic root of 91906788 is about 451.2832310556.

The spelling of 91906788 in words is "ninety-one million, nine hundred six thousand, seven hundred eighty-eight".