91375473840 has 320 divisors, whose sum is σ = 327339048960. Its totient is φ = 20654161920.

The previous prime is 91375473811. The next prime is 91375473857. The reversal of 91375473840 is 4837457319.

It is a happy number.

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, 98358496 + ... + 98359424.

It is an arithmetic number, because the mean of its divisors is an integer number (1022934528).

Almost surely, 2^91375473840 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 91375473840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163669524480).

91375473840 is an abundant number, since it is smaller than the sum of its proper divisors (235963575120).

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

91375473840 is a wasteful number, since it uses less digits than its factorization.

91375473840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 1534 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 91375473840 in words is "ninety-one billion, three hundred seventy-five million, four hundred seventy-three thousand, eight hundred forty".