68921078 has 4 divisors (see below), whose sum is σ = 103381620. Its totient is φ = 34460538.

The previous prime is 68921071. The next prime is 68921089. The reversal of 68921078 is 87012986.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×68921078² = 9500229985364168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68921071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17230268 + ... + 17230271.

It is an arithmetic number, because the mean of its divisors is an integer number (25845405).

Almost surely, 2^68921078 is an apocalyptic number.

68921078 is a deficient number, since it is larger than the sum of its proper divisors (34460542).

68921078 is a wasteful number, since it uses less digits than its factorization.

68921078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34460541.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 68921078 is about 8301.8719575768. The cubic root of 68921078 is about 410.0001546698. Note that the first 3 decimals are identical.

The spelling of 68921078 in words is "sixty-eight million, nine hundred twenty-one thousand, seventy-eight".