91005628 has 24 divisors (see below), whose sum is σ = 182603232. Its totient is φ = 38875584.

The previous prime is 91005623. The next prime is 91005647. The reversal of 91005628 is 82650019.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 91005628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91005623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3750 + ... + 14002.

It is an arithmetic number, because the mean of its divisors is an integer number (7608468).

Almost surely, 2^91005628 is an apocalyptic number.

It is an amenable number.

91005628 is an abundant number, since it is smaller than the sum of its proper divisors (91597604).

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

91005628 is a wasteful number, since it uses less digits than its factorization.

91005628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10581 (or 10579 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 91005628 is about 9539.6869969617. The cubic root of 91005628 is about 449.8034170157.

The spelling of 91005628 in words is "ninety-one million, five thousand, six hundred twenty-eight".