91408782 has 16 divisors (see below), whose sum is σ = 186267600. Its totient is φ = 29894592.

The previous prime is 91408781. The next prime is 91408799. The reversal of 91408782 is 28780419.

It is a self number, because there is not a number n which added to its sum of digits gives 91408782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91408781) 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, 143407 + ... + 144042.

It is an arithmetic number, because the mean of its divisors is an integer number (11641725).

Almost surely, 2^91408782 is an apocalyptic number.

91408782 is an abundant number, since it is smaller than the sum of its proper divisors (94858818).

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

91408782 is a wasteful number, since it uses less digits than its factorization.

91408782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287507.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 91408782 is about 9560.7940046839. The cubic root of 91408782 is about 450.4666467875.

The spelling of 91408782 in words is "ninety-one million, four hundred eight thousand, seven hundred eighty-two".