91783560 has 128 divisors (see below), whose sum is σ = 310210560. Its totient is φ = 21523200.

The previous prime is 91783537. The next prime is 91783577. The reversal of 91783560 is 6538719.

91783560 = T₁₃₉ + T₁₄₀ + ... + T₈₂₀.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39799 + ... + 42041.

It is an arithmetic number, because the mean of its divisors is an integer number (2423520).

Almost surely, 2^91783560 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 91783560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155105280).

91783560 is an abundant number, since it is smaller than the sum of its proper divisors (218427000).

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

91783560 is a wasteful number, since it uses less digits than its factorization.

91783560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 91783560 is about 9580.3736879101. The cubic root of 91783560 is about 451.0814483440.

The spelling of 91783560 in words is "ninety-one million, seven hundred eighty-three thousand, five hundred sixty".