68878072281 has 16 divisors (see below), whose sum is σ = 96677994240. Its totient is φ = 43498783440.

The previous prime is 68878072261. The next prime is 68878072297. The reversal of 68878072281 is 18227087886.

It is not a de Polignac number, because 68878072281 - 2¹³ = 68878064089 is a prime.

It is a super-2 number, since 2×68878072281² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (68878072261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940726 + ... + 1011296.

It is an arithmetic number, because the mean of its divisors is an integer number (6042374640).

Almost surely, 2^68878072281 is an apocalyptic number.

It is an amenable number.

68878072281 is a deficient number, since it is larger than the sum of its proper divisors (27799921959).

68878072281 is a wasteful number, since it uses less digits than its factorization.

68878072281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87716.

The product of its (nonzero) digits is 4816896, while the sum is 57.

The spelling of 68878072281 in words is "sixty-eight billion, eight hundred seventy-eight million, seventy-two thousand, two hundred eighty-one".