91438308 has 120 divisors (see below), whose sum is σ = 272781432. Its totient is φ = 26459136.

The previous prime is 91438307. The next prime is 91438331. The reversal of 91438308 is 80383419.

It can be written as a sum of positive squares in 4 ways, for example, as 15539364 + 75898944 = 3942^2 + 8712^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (91438307) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70966 + ... + 72242.

Almost surely, 2^91438308 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 91438308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136390716).

91438308 is an abundant number, since it is smaller than the sum of its proper divisors (181343124).

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

91438308 is a wasteful number, since it uses less digits than its factorization.

91438308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 91438308 is about 9562.3379986277. The cubic root of 91438308 is about 450.5151433912.

The spelling of 91438308 in words is "ninety-one million, four hundred thirty-eight thousand, three hundred eight".