91571064 has 64 divisors (see below), whose sum is σ = 248586240. Its totient is φ = 27941760.

The previous prime is 91571063. The next prime is 91571071. The reversal of 91571064 is 46017519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91571063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38469 + ... + 40779.

It is an arithmetic number, because the mean of its divisors is an integer number (3884160).

Almost surely, 2^91571064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91571064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124293120).

91571064 is an abundant number, since it is smaller than the sum of its proper divisors (157015176).

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

91571064 is a wasteful number, since it uses less digits than its factorization.

91571064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460 (or 2456 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 91571064 is about 9569.2770886833. The cubic root of 91571064 is about 450.7330668865.

The spelling of 91571064 in words is "ninety-one million, five hundred seventy-one thousand, sixty-four".