68492046240 has 144 divisors (see below), whose sum is σ = 234733386888. Its totient is φ = 18186067968.

The previous prime is 68492046223. The next prime is 68492046247. The reversal of 68492046240 is 4264029486.

68492046240 is a `hidden beast` number, since 68 + 4 + 92 + 0 + 462 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 46567913616 + 21924132624 = 215796^2 + 148068^2 .

It is a tau number, because it is divible by the number of its divisors (144).

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

It is not an unprimeable number, because it can be changed into a prime (68492046247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 233452 + ... + 437588.

Almost surely, 2^68492046240 is an apocalyptic number.

68492046240 is a gapful number since it is divisible by the number (60) 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 68492046240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117366693444).

68492046240 is an abundant number, since it is smaller than the sum of its proper divisors (166241340648).

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

68492046240 is a wasteful number, since it uses less digits than its factorization.

68492046240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204391 (or 204380 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 68492046240 in words is "sixty-eight billion, four hundred ninety-two million, forty-six thousand, two hundred forty".