91402440402 has 256 divisors, whose sum is σ = 241566474240. Its totient is φ = 22385922048.

The previous prime is 91402440379. The next prime is 91402440403. The reversal of 91402440402 is 20404420419.

It is a super-2 number, since 2×91402440402² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91402440402.

It is not an unprimeable number, because it can be changed into a prime (91402440403) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 120742608 + ... + 120743364.

It is an arithmetic number, because the mean of its divisors is an integer number (943619040).

Almost surely, 2^91402440402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91402440402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120783237120).

91402440402 is an abundant number, since it is smaller than the sum of its proper divisors (150164033838).

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

91402440402 is a wasteful number, since it uses less digits than its factorization.

91402440402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017.

The product of its (nonzero) digits is 9216, while the sum is 30.

The spelling of 91402440402 in words is "ninety-one billion, four hundred two million, four hundred forty thousand, four hundred two".