91484778 has 64 divisors (see below), whose sum is σ = 231413760. Its totient is φ = 23419200.

The previous prime is 91484749. The next prime is 91484797. The reversal of 91484778 is 87748419.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31408 + ... + 34196.

It is an arithmetic number, because the mean of its divisors is an integer number (3615840).

Almost surely, 2^91484778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91484778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115706880).

91484778 is an abundant number, since it is smaller than the sum of its proper divisors (139928982).

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

91484778 is a wasteful number, since it uses less digits than its factorization.

91484778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883.

The product of its digits is 451584, while the sum is 48.

The square root of 91484778 is about 9564.7675350737. The cubic root of 91484778 is about 450.5914494589.

The spelling of 91484778 in words is "ninety-one million, four hundred eighty-four thousand, seven hundred seventy-eight".