91570560 has 128 divisors (see below), whose sum is σ = 300002400. Its totient is φ = 23740416.

The previous prime is 91570541. The next prime is 91570561. The reversal of 91570560 is 6507519.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91570561) 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, 70396 + ... + 71684.

Almost surely, 2^91570560 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 91570560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150001200).

91570560 is an abundant number, since it is smaller than the sum of its proper divisors (208431840).

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

91570560 is a wasteful number, since it uses less digits than its factorization.

91570560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348 (or 1336 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 33.

The square root of 91570560 is about 9569.2507543694. The cubic root of 91570560 is about 450.7322399517.

The spelling of 91570560 in words is "ninety-one million, five hundred seventy thousand, five hundred sixty".