97819581440 has 352 divisors, whose sum is σ = 285241098240. Its totient is φ = 31460622336.

The previous prime is 97819581389. The next prime is 97819581479. The reversal of 97819581440 is 4418591879.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43687841 + ... + 43690079.

Almost surely, 2^97819581440 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 97819581440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142620549120).

97819581440 is an abundant number, since it is smaller than the sum of its proper divisors (187421516800).

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

97819581440 is a wasteful number, since it uses less digits than its factorization.

97819581440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 56.

The spelling of 97819581440 in words is "ninety-seven billion, eight hundred nineteen million, five hundred eighty-one thousand, four hundred forty".