91550394 has 48 divisors (see below), whose sum is σ = 215115264. Its totient is φ = 27972000.

The previous prime is 91550369. The next prime is 91550399. The reversal of 91550394 is 49305519.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (91550399) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34039 + ... + 36629.

It is an arithmetic number, because the mean of its divisors is an integer number (4481568).

Almost surely, 2^91550394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91550394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107557632).

91550394 is an abundant number, since it is smaller than the sum of its proper divisors (123564870).

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

91550394 is a wasteful number, since it uses less digits than its factorization.

91550394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763 (or 2760 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 91550394 is about 9568.1970088413. The cubic root of 91550394 is about 450.6991502277.

The spelling of 91550394 in words is "ninety-one million, five hundred fifty thousand, three hundred ninety-four".