91865885440 has 144 divisors (see below), whose sum is σ = 254310719040. Its totient is φ = 31142707200.

The previous prime is 91865885393. The next prime is 91865885479. The reversal of 91865885440 is 4458856819.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739840 + ... + 855040.

It is an arithmetic number, because the mean of its divisors is an integer number (1766046660).

Almost surely, 2^91865885440 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 91865885440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127155359520).

91865885440 is an abundant number, since it is smaller than the sum of its proper divisors (162444833600).

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

91865885440 is a wasteful number, since it uses less digits than its factorization.

91865885440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115318 (or 115304 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 58.

The spelling of 91865885440 in words is "ninety-one billion, eight hundred sixty-five million, eight hundred eighty-five thousand, four hundred forty".