1978294668 has 48 divisors (see below), whose sum is σ = 5553112320. Its totient is φ = 535477824.

The previous prime is 1978294657. The next prime is 1978294691. The reversal of 1978294668 is 8664928791.

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, 618171 + ... + 621362.

It is an arithmetic number, because the mean of its divisors is an integer number (115689840).

Almost surely, 2^1978294668 is an apocalyptic number.

It is an amenable number.

1978294668 is an abundant number, since it is smaller than the sum of its proper divisors (3574817652).

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

1978294668 is a wasteful number, since it uses less digits than its factorization.

1978294668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239566 (or 1239564 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The square root of 1978294668 is about 44478.0245514569. The cubic root of 1978294668 is about 1255.3466274274.

The spelling of 1978294668 in words is "one billion, nine hundred seventy-eight million, two hundred ninety-four thousand, six hundred sixty-eight".