91172004 has 96 divisors (see below), whose sum is σ = 268800000. Its totient is φ = 23362560.

The previous prime is 91171967. The next prime is 91172009. The reversal of 91172004 is 40027119.

It is not an unprimeable number, because it can be changed into a prime (91172009) 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, 72372 + ... + 73620.

It is an arithmetic number, because the mean of its divisors is an integer number (2800000).

Almost surely, 2^91172004 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 91172004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134400000).

91172004 is an abundant number, since it is smaller than the sum of its proper divisors (177627996).

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

91172004 is a wasteful number, since it uses less digits than its factorization.

91172004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 91172004 is about 9548.4032172924. The cubic root of 91172004 is about 450.0773595399.

The spelling of 91172004 in words is "ninety-one million, one hundred seventy-two thousand, four".