91026040 has 32 divisors (see below), whose sum is σ = 234067680. Its totient is φ = 31208832.

The previous prime is 91026029. The next prime is 91026043. The reversal of 91026040 is 4062019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91026043) 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, 162267 + ... + 162826.

It is an arithmetic number, because the mean of its divisors is an integer number (7314615).

Almost surely, 2^91026040 is an apocalyptic number.

It is an amenable number.

91026040 is an abundant number, since it is smaller than the sum of its proper divisors (143041640).

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

91026040 is a wasteful number, since it uses less digits than its factorization.

91026040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325111 (or 325107 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 91026040 is about 9540.7567834004. The cubic root of 91026040 is about 449.8370438773.

Adding to 91026040 its reverse (4062019), we get a palindrome (95088059).

The spelling of 91026040 in words is "ninety-one million, twenty-six thousand, forty".