91451864 has 128 divisors (see below), whose sum is σ = 223257600. Its totient is φ = 34214400.

The previous prime is 91451863. The next prime is 91451873. The reversal of 91451864 is 46815419.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91451863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 905414 + ... + 905514.

It is an arithmetic number, because the mean of its divisors is an integer number (1744200).

Almost surely, 2^91451864 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 91451864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111628800).

91451864 is an abundant number, since it is smaller than the sum of its proper divisors (131805736).

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

91451864 is a wasteful number, since it uses less digits than its factorization.

91451864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 189 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 91451864 is about 9563.0467948243. The cubic root of 91451864 is about 450.5374056925.

The spelling of 91451864 in words is "ninety-one million, four hundred fifty-one thousand, eight hundred sixty-four".