91672218 has 48 divisors (see below), whose sum is σ = 219765312. Its totient is φ = 27384000.

The previous prime is 91672213. The next prime is 91672223. The reversal of 91672218 is 81227619.

It is an interprime number because it is at equal distance from previous prime (91672213) and next prime (91672223).

It is not an unprimeable number, because it can be changed into a prime (91672213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10798 + ... + 17318.

It is an arithmetic number, because the mean of its divisors is an integer number (4578444).

Almost surely, 2^91672218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91672218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109882656).

91672218 is an abundant number, since it is smaller than the sum of its proper divisors (128093094).

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

91672218 is a wasteful number, since it uses less digits than its factorization.

91672218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611 (or 6608 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 91672218 is about 9574.5609821025. The cubic root of 91672218 is about 450.8989732790.

The spelling of 91672218 in words is "ninety-one million, six hundred seventy-two thousand, two hundred eighteen".