91769440 has 48 divisors (see below), whose sum is σ = 247780512. Its totient is φ = 31463424.

The previous prime is 91769429. The next prime is 91769441. The reversal of 91769440 is 4496719.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 91769393 and 91769402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91769441) 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 7 ways as a sum of consecutive naturals, for example, 39849 + ... + 42088.

It is an arithmetic number, because the mean of its divisors is an integer number (5162094).

Almost surely, 2^91769440 is an apocalyptic number.

It is an amenable number.

91769440 is an abundant number, since it is smaller than the sum of its proper divisors (156011072).

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

91769440 is a wasteful number, since it uses less digits than its factorization.

91769440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81959 (or 81951 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 91769440 is about 9579.6367363277. The cubic root of 91769440 is about 451.0583156730.

The spelling of 91769440 in words is "ninety-one million, seven hundred sixty-nine thousand, four hundred forty".