93391280640 has 640 divisors, whose sum is σ = 399117312000. Its totient is φ = 20221083648.

The previous prime is 93391280639. The next prime is 93391280701. The reversal of 93391280640 is 4608219339.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 9187881 + ... + 9198039.

It is an arithmetic number, because the mean of its divisors is an integer number (623620800).

Almost surely, 2^93391280640 is an apocalyptic number.

93391280640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 93391280640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199558656000).

93391280640 is an abundant number, since it is smaller than the sum of its proper divisors (305726031360).

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

93391280640 is a wasteful number, since it uses less digits than its factorization.

93391280640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10217 (or 10195 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

Adding to 93391280640 its reverse (4608219339), we get a palindrome (97999499979).

The spelling of 93391280640 in words is "ninety-three billion, three hundred ninety-one million, two hundred eighty thousand, six hundred forty".