91053840 has 40 divisors (see below), whose sum is σ = 282267648. Its totient is φ = 24280960.

The previous prime is 91053829. The next prime is 91053847. The reversal of 91053840 is 4835019.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 91053798 and 91053807.

It is not an unprimeable number, because it can be changed into a prime (91053847) 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, 189456 + ... + 189935.

Almost surely, 2^91053840 is an apocalyptic number.

It is an amenable number.

91053840 is an abundant number, since it is smaller than the sum of its proper divisors (191213808).

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

91053840 is a wasteful number, since it uses less digits than its factorization.

91053840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379407 (or 379401 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 91053840 is about 9542.2135796680. The cubic root of 91053840 is about 449.8828336936.

Adding to 91053840 its reverse (4835019), we get a palindrome (95888859).

The spelling of 91053840 in words is "ninety-one million, fifty-three thousand, eight hundred forty".