91384380 has 36 divisors (see below), whose sum is σ = 277199832. Its totient is φ = 24369120.

The previous prime is 91384369. The next prime is 91384387. The reversal of 91384380 is 8348319.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×91384380³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91384387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253666 + ... + 254025.

Almost surely, 2^91384380 is an apocalyptic number.

91384380 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91384380 is an abundant number, since it is smaller than the sum of its proper divisors (185815452).

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

91384380 is a wasteful number, since it uses less digits than its factorization.

91384380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507706 (or 507701 counting only the distinct ones).

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

The square root of 91384380 is about 9559.5177702644. The cubic root of 91384380 is about 450.4265584971.

The spelling of 91384380 in words is "ninety-one million, three hundred eighty-four thousand, three hundred eighty".