68413978 has 4 divisors (see below), whose sum is σ = 102620970. Its totient is φ = 34206988.

The previous prime is 68413973. The next prime is 68413991. The reversal of 68413978 is 87931486.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87931486 = 2 ⋅43965743.

It can be written as a sum of positive squares in only one way, i.e., 39652209 + 28761769 = 6297^2 + 5363^2 .

It is not an unprimeable number, because it can be changed into a prime (68413973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17103493 + ... + 17103496.

Almost surely, 2^68413978 is an apocalyptic number.

68413978 is a deficient number, since it is larger than the sum of its proper divisors (34206992).

68413978 is a wasteful number, since it uses less digits than its factorization.

68413978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34206991.

The product of its digits is 290304, while the sum is 46.

The square root of 68413978 is about 8271.2742670038. The cubic root of 68413978 is about 408.9921268683.

The spelling of 68413978 in words is "sixty-eight million, four hundred thirteen thousand, nine hundred seventy-eight".