91925840 has 40 divisors (see below), whose sum is σ = 215745120. Its totient is φ = 36423296.

The previous prime is 91925831. The next prime is 91925863. The reversal of 91925840 is 4852919.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 91925794 and 91925803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3191 + ... + 13929.

It is an arithmetic number, because the mean of its divisors is an integer number (5393628).

Almost surely, 2^91925840 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 91925840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107872560).

91925840 is an abundant number, since it is smaller than the sum of its proper divisors (123819280).

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

91925840 is a wasteful number, since it uses less digits than its factorization.

91925840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10859 (or 10853 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 91925840 is about 9587.7964100204. The cubic root of 91925840 is about 451.3144121188.

The spelling of 91925840 in words is "ninety-one million, nine hundred twenty-five thousand, eight hundred forty".