91004928 has 168 divisors, whose sum is σ = 289913568. Its totient is φ = 24870912.

The previous prime is 91004923. The next prime is 91004957. The reversal of 91004928 is 82940019.

It is a tau number, because it is divible by the number of its divisors (168).

It is not an unprimeable number, because it can be changed into a prime (91004923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3956725 + ... + 3956747.

It is an arithmetic number, because the mean of its divisors is an integer number (1725676).

Almost surely, 2^91004928 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 91004928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144956784).

91004928 is an abundant number, since it is smaller than the sum of its proper divisors (198908640).

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

91004928 is an equidigital number, since it uses as much as digits as its factorization.

91004928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 91004928 is about 9539.6503080564. The cubic root of 91004928 is about 449.8022637419.

It can be divided in two parts, 9100 and 4928, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 91004928 in words is "ninety-one million, four thousand, nine hundred twenty-eight".