91420404 has 12 divisors (see below), whose sum is σ = 213314304. Its totient is φ = 30473464.

The previous prime is 91420403. The next prime is 91420409. The reversal of 91420404 is 40402419.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91420403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3809172 + ... + 3809195.

It is an arithmetic number, because the mean of its divisors is an integer number (17776192).

Almost surely, 2^91420404 is an apocalyptic number.

It is an amenable number.

91420404 is an abundant number, since it is smaller than the sum of its proper divisors (121893900).

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

91420404 is a wasteful number, since it uses less digits than its factorization.

91420404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7618374 (or 7618372 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 91420404 is about 9561.4017800739. The cubic root of 91420404 is about 450.4857372272.

The spelling of 91420404 in words is "ninety-one million, four hundred twenty thousand, four hundred four".