1978681700 has 36 divisors (see below), whose sum is σ = 4295891712. Its totient is φ = 791076000.

The previous prime is 1978681699. The next prime is 1978681709. The reversal of 1978681700 is 71868791.

It is not an unprimeable number, because it can be changed into a prime (1978681709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273125 + ... + 280275.

Almost surely, 2^1978681700 is an apocalyptic number.

1978681700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978681700 is an abundant number, since it is smaller than the sum of its proper divisors (2317210012).

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

1978681700 is a wasteful number, since it uses less digits than its factorization.

1978681700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9932 (or 9925 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 1978681700 is about 44482.3751614052. The cubic root of 1978681700 is about 1255.4284870955.

The spelling of 1978681700 in words is "one billion, nine hundred seventy-eight million, six hundred eighty-one thousand, seven hundred".