91641072 has 40 divisors (see below), whose sum is σ = 237244240. Its totient is φ = 30481920.

The previous prime is 91641071. The next prime is 91641097. The reversal of 91641072 is 27014619.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91641071) 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, 24204 + ... + 27732.

It is an arithmetic number, because the mean of its divisors is an integer number (5931106).

Almost surely, 2^91641072 is an apocalyptic number.

It is an amenable number.

91641072 is an abundant number, since it is smaller than the sum of its proper divisors (145603168).

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

91641072 is a wasteful number, since it uses less digits than its factorization.

91641072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081 (or 4075 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 91641072 is about 9572.9343463747. The cubic root of 91641072 is about 450.8479025893.

The spelling of 91641072 in words is "ninety-one million, six hundred forty-one thousand, seventy-two".