91945408 has 56 divisors (see below), whose sum is σ = 194584320. Its totient is φ = 42981120.

The previous prime is 91945397. The next prime is 91945409. The reversal of 91945408 is 80454919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91945409) 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, 100473 + ... + 101383.

It is an arithmetic number, because the mean of its divisors is an integer number (3474720).

Almost surely, 2^91945408 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 91945408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97292160).

91945408 is an abundant number, since it is smaller than the sum of its proper divisors (102638912).

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

91945408 is a wasteful number, since it uses less digits than its factorization.

91945408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 91945408 is about 9588.8168196081. The cubic root of 91945408 is about 451.3464331982.

The spelling of 91945408 in words is "ninety-one million, nine hundred forty-five thousand, four hundred eight".