91069440 has 396 divisors, whose sum is σ = 372439368. Its totient is φ = 18923520.

The previous prime is 91069439. The next prime is 91069441. The reversal of 91069440 is 4496019.

It is an interprime number because it is at equal distance from previous prime (91069439) and next prime (91069441).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91069441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8279035 + ... + 8279045.

Almost surely, 2^91069440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91069440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186219684).

91069440 is an abundant number, since it is smaller than the sum of its proper divisors (281369928).

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

91069440 is a wasteful number, since it uses less digits than its factorization.

91069440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 91069440 is about 9543.0309650551. The cubic root of 91069440 is about 449.9085246161.

The spelling of 91069440 in words is "ninety-one million, sixty-nine thousand, four hundred forty".