1978975085 has 32 divisors (see below), whose sum is σ = 2565222912. Its totient is φ = 1461841920.

The previous prime is 1978975073. The next prime is 1978975093. The reversal of 1978975085 is 5805798791.

It is not a de Polignac number, because 1978975085 - 2⁶ = 1978975021 is a prime.

It is a Duffinian number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 455192 + ... + 459518.

It is an arithmetic number, because the mean of its divisors is an integer number (80163216).

Almost surely, 2^1978975085 is an apocalyptic number.

It is an amenable number.

1978975085 is a deficient number, since it is larger than the sum of its proper divisors (586247827).

1978975085 is a wasteful number, since it uses less digits than its factorization.

1978975085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 6350400, while the sum is 59.

The square root of 1978975085 is about 44485.6728059720. The cubic root of 1978975085 is about 1255.4905327299.

The spelling of 1978975085 in words is "one billion, nine hundred seventy-eight million, nine hundred seventy-five thousand, eighty-five".