1978027500 has 60 divisors (see below), whose sum is σ = 5767422584. Its totient is φ = 527472000.

The previous prime is 1978027481. The next prime is 1978027523. The reversal of 1978027500 is 57208791.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 124369 + ... + 139368.

Almost surely, 2^1978027500 is an apocalyptic number.

1978027500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978027500 is an abundant number, since it is smaller than the sum of its proper divisors (3789395084).

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

1978027500 is a wasteful number, since it uses less digits than its factorization.

1978027500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263764 (or 263747 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 1978027500 is about 44475.0210792530. The cubic root of 1978027500 is about 1255.2901135096.

The spelling of 1978027500 in words is "one billion, nine hundred seventy-eight million, twenty-seven thousand, five hundred".