91670277888 has 432 divisors, whose sum is σ = 316486550016. Its totient is φ = 24950661120.

The previous prime is 91670277887. The next prime is 91670277889. The reversal of 91670277888 is 88877207619.

It is an interprime number because it is at equal distance from previous prime (91670277887) and next prime (91670277889).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91670277887) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156167131 + ... + 156167717.

Almost surely, 2^91670277888 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 91670277888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158243275008).

91670277888 is an abundant number, since it is smaller than the sum of its proper divisors (224816272128).

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

91670277888 is a wasteful number, since it uses less digits than its factorization.

91670277888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 63.

The spelling of 91670277888 in words is "ninety-one billion, six hundred seventy million, two hundred seventy-seven thousand, eight hundred eighty-eight".