91927440 has 320 divisors, whose sum is σ = 356762880. Its totient is φ = 21565440.

The previous prime is 91927403. The next prime is 91927457. The reversal of 91927440 is 4472919.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91927395 and 91927404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1259244 + ... + 1259316.

It is an arithmetic number, because the mean of its divisors is an integer number (1114884).

Almost surely, 2^91927440 is an apocalyptic number.

91927440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91927440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178381440).

91927440 is an abundant number, since it is smaller than the sum of its proper divisors (264835440).

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

91927440 is a wasteful number, since it uses less digits than its factorization.

91927440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 91927440 is about 9587.8798490594. The cubic root of 91927440 is about 451.3170305297.

The spelling of 91927440 in words is "ninety-one million, nine hundred twenty-seven thousand, four hundred forty".