91428168 has 64 divisors (see below), whose sum is σ = 247665600. Its totient is φ = 27959040.

The previous prime is 91428163. The next prime is 91428241. The reversal of 91428168 is 86182419.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (91428163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55663 + ... + 57281.

It is an arithmetic number, because the mean of its divisors is an integer number (3869775).

Almost surely, 2^91428168 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 91428168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123832800).

91428168 is an abundant number, since it is smaller than the sum of its proper divisors (156237432).

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

91428168 is a wasteful number, since it uses less digits than its factorization.

91428168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822 (or 1818 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 91428168 is about 9561.8077788669. The cubic root of 91428168 is about 450.4984895673.

The spelling of 91428168 in words is "ninety-one million, four hundred twenty-eight thousand, one hundred sixty-eight".