91408288394 has 8 divisors (see below), whose sum is σ = 137326338468. Its totient is φ = 45632842240.

The previous prime is 91408288381. The next prime is 91408288399. The reversal of 91408288394 is 49388280419.

It can be written as a sum of positive squares in 2 ways, for example, as 91377430369 + 30858025 = 302287^2 + 5555^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (91408288399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35649377 + ... + 35651940.

Almost surely, 2^91408288394 is an apocalyptic number.

91408288394 is a deficient number, since it is larger than the sum of its proper divisors (45918050074).

91408288394 is a wasteful number, since it uses less digits than its factorization.

91408288394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71301960.

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 91408288394 in words is "ninety-one billion, four hundred eight million, two hundred eighty-eight thousand, three hundred ninety-four".