91006772 has 12 divisors (see below), whose sum is σ = 161051940. Its totient is φ = 44991936.

The previous prime is 91006759. The next prime is 91006787. The reversal of 91006772 is 27760019.

It can be written as a sum of positive squares in 2 ways, for example, as 4999696 + 86007076 = 2236^2 + 9274^2 .

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, 127463 + ... + 128174.

It is an arithmetic number, because the mean of its divisors is an integer number (13420995).

Almost surely, 2^91006772 is an apocalyptic number.

It is an amenable number.

91006772 is a deficient number, since it is larger than the sum of its proper divisors (70045168).

91006772 is a wasteful number, since it uses less digits than its factorization.

91006772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255730 (or 255728 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 91006772 is about 9539.7469568118. The cubic root of 91006772 is about 449.8053017817.

The spelling of 91006772 in words is "ninety-one million, six thousand, seven hundred seventy-two".