91413840 has 80 divisors (see below), whose sum is σ = 323872128. Its totient is φ = 20894208.

The previous prime is 91413827. The next prime is 91413853. The reversal of 91413840 is 4831419.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91413827) and next prime (91413853).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×91413840³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 91413798 and 91413807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25527 + ... + 28886.

Almost surely, 2^91413840 is an apocalyptic number.

It is an amenable number.

91413840 is an abundant number, since it is smaller than the sum of its proper divisors (232458288).

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

91413840 is a wasteful number, since it uses less digits than its factorization.

91413840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54436 (or 54430 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 91413840 is about 9561.0585188043. The cubic root of 91413840 is about 450.4749553192.

The spelling of 91413840 in words is "ninety-one million, four hundred thirteen thousand, eight hundred forty".