1981782064 has 20 divisors (see below), whose sum is σ = 3841066656. Its totient is φ = 990539072.

The previous prime is 1981782031. The next prime is 1981782107. The reversal of 1981782064 is 4602871891.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27882 + ... + 68854.

Almost surely, 2^1981782064 is an apocalyptic number.

It is an amenable number.

1981782064 is a deficient number, since it is larger than the sum of its proper divisors (1859284592).

1981782064 is a wasteful number, since it uses less digits than its factorization.

1981782064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44004 (or 43998 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1981782064 is about 44517.2108739979. The cubic root of 1981782064 is about 1256.0838483788.

The spelling of 1981782064 in words is "one billion, nine hundred eighty-one million, seven hundred eighty-two thousand, sixty-four".