91623840 has 384 divisors, whose sum is σ = 375072768. Its totient is φ = 18247680.

The previous prime is 91623839. The next prime is 91623853. The reversal of 91623840 is 4832619.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1367487 + ... + 1367553.

It is an arithmetic number, because the mean of its divisors is an integer number (976752).

Almost surely, 2^91623840 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 91623840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187536384).

91623840 is an abundant number, since it is smaller than the sum of its proper divisors (283448928).

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

91623840 is a wasteful number, since it uses less digits than its factorization.

91623840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 91623840 is about 9572.0342665496. The cubic root of 91623840 is about 450.8196419783.

The spelling of 91623840 in words is "ninety-one million, six hundred twenty-three thousand, eight hundred forty".