91005000478 has 32 divisors (see below), whose sum is σ = 159866784000. Its totient is φ = 38038223040.

The previous prime is 91005000469. The next prime is 91005000479. The reversal of 91005000478 is 87400050019.

It is a happy number.

It is a super-2 number, since 2×91005000478² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91005000479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1813773 + ... + 1863271.

It is an arithmetic number, because the mean of its divisors is an integer number (4995837000).

Almost surely, 2^91005000478 is an apocalyptic number.

91005000478 is a deficient number, since it is larger than the sum of its proper divisors (68861783522).

91005000478 is a wasteful number, since it uses less digits than its factorization.

91005000478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52752.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 91005000478 in words is "ninety-one billion, five million, four hundred seventy-eight", and thus it is an aban number.