91055640 has 64 divisors (see below), whose sum is σ = 294184800. Its totient is φ = 22413312.

The previous prime is 91055617. The next prime is 91055647. The reversal of 91055640 is 4655019.

It is a super-2 number, since 2×91055640² = 16582259151619200, which contains 22 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 = 91055598 and 91055607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91055647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27625 + ... + 30744.

Almost surely, 2^91055640 is an apocalyptic number.

It is an amenable number.

91055640 is an abundant number, since it is smaller than the sum of its proper divisors (203129160).

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

91055640 is a wasteful number, since it uses less digits than its factorization.

91055640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58396 (or 58392 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 91055640 is about 9542.3078969398. The cubic root of 91055640 is about 449.8857981806.

The spelling of 91055640 in words is "ninety-one million, fifty-five thousand, six hundred forty".