68787978 has 32 divisors (see below), whose sum is σ = 160579584. Its totient is φ = 19234992.

The previous prime is 68787919. The next prime is 68787997. The reversal of 68787978 is 87978786.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15450 + ... + 19397.

It is an arithmetic number, because the mean of its divisors is an integer number (5018112).

Almost surely, 2^68787978 is an apocalyptic number.

68787978 is an abundant number, since it is smaller than the sum of its proper divisors (91791606).

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

68787978 is a wasteful number, since it uses less digits than its factorization.

68787978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34906.

The product of its digits is 9483264, while the sum is 60.

The square root of 68787978 is about 8293.8518192695. The cubic root of 68787978 is about 409.7360545861.

The spelling of 68787978 in words is "sixty-eight million, seven hundred eighty-seven thousand, nine hundred seventy-eight".