91609976370 has 128 divisors (see below), whose sum is σ = 241497780480. Its totient is φ = 22056468480.

The previous prime is 91609976333. The next prime is 91609976443. The reversal of 91609976370 is 7367990619.

It is a self number, because there is not a number n which added to its sum of digits gives 91609976370.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70631562 + ... + 70632858.

It is an arithmetic number, because the mean of its divisors is an integer number (1886701410).

Almost surely, 2^91609976370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91609976370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120748890240).

91609976370 is an abundant number, since it is smaller than the sum of its proper divisors (149887804110).

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

91609976370 is a wasteful number, since it uses less digits than its factorization.

91609976370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620.

The product of its (nonzero) digits is 3857868, while the sum is 57.

The spelling of 91609976370 in words is "ninety-one billion, six hundred nine million, nine hundred seventy-six thousand, three hundred seventy".