68540947398 has 96 divisors (see below), whose sum is σ = 185435557632. Its totient is φ = 17775345600.

The previous prime is 68540947303. The next prime is 68540947417. The reversal of 68540947398 is 89374904586.

It is a super-2 number, since 2×68540947398² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 867193 + ... + 942923.

It is an arithmetic number, because the mean of its divisors is an integer number (1931620392).

Almost surely, 2^68540947398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68540947398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92717778816).

68540947398 is an abundant number, since it is smaller than the sum of its proper divisors (116894610234).

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

68540947398 is a wasteful number, since it uses less digits than its factorization.

68540947398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76410 (or 76407 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 68540947398 in words is "sixty-eight billion, five hundred forty million, nine hundred forty-seven thousand, three hundred ninety-eight".