91004472 has 144 divisors (see below), whose sum is σ = 277772040. Its totient is φ = 27900288.

The previous prime is 91004467. The next prime is 91004483. The reversal of 91004472 is 27440019.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 328398 + ... + 328674.

Almost surely, 2^91004472 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 91004472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138886020).

91004472 is an abundant number, since it is smaller than the sum of its proper divisors (186767568).

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

91004472 is a wasteful number, since it uses less digits than its factorization.

91004472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 91004472 is about 9539.6264077793. The cubic root of 91004472 is about 449.8015124633.

It can be divided in two parts, 910044 and 72, that added together give a square (910116 = 954²).

The spelling of 91004472 in words is "ninety-one million, four thousand, four hundred seventy-two".