91284072 has 32 divisors (see below), whose sum is σ = 248957280. Its totient is φ = 27661760.

The previous prime is 91284071. The next prime is 91284097. The reversal of 91284072 is 27048219.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (91284071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172623 + ... + 173150.

It is an arithmetic number, because the mean of its divisors is an integer number (7779915).

Almost surely, 2^91284072 is an apocalyptic number.

It is an amenable number.

91284072 is an abundant number, since it is smaller than the sum of its proper divisors (157673208).

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

91284072 is a wasteful number, since it uses less digits than its factorization.

91284072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345793 (or 345789 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 91284072 is about 9554.2698308139. The cubic root of 91284072 is about 450.2616946972.

The spelling of 91284072 in words is "ninety-one million, two hundred eighty-four thousand, seventy-two".