1978210068 has 24 divisors (see below), whose sum is σ = 4764721920. Its totient is φ = 638132160.

The previous prime is 1978210063. The next prime is 1978210093. The reversal of 1978210068 is 8600128791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978210063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2658513 + ... + 2659256.

It is an arithmetic number, because the mean of its divisors is an integer number (198530080).

Almost surely, 2^1978210068 is an apocalyptic number.

It is an amenable number.

1978210068 is an abundant number, since it is smaller than the sum of its proper divisors (2786511852).

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

1978210068 is a wasteful number, since it uses less digits than its factorization.

1978210068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5317807 (or 5317805 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 1978210068 is about 44477.0735098432. The cubic root of 1978210068 is about 1255.3287325808.

The spelling of 1978210068 in words is "one billion, nine hundred seventy-eight million, two hundred ten thousand, sixty-eight".