2009751978 has 16 divisors (see below), whose sum is σ = 4328696736. Its totient is φ = 618385200.

The previous prime is 2009751967. The next prime is 2009752027. The reversal of 2009751978 is 8791579002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12882948 + ... + 12883103.

It is an arithmetic number, because the mean of its divisors is an integer number (270543546).

Almost surely, 2^2009751978 is an apocalyptic number.

2009751978 is an abundant number, since it is smaller than the sum of its proper divisors (2318944758).

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

2009751978 is a wasteful number, since it uses less digits than its factorization.

2009751978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25766069.

The product of its (nonzero) digits is 317520, while the sum is 48.

The square root of 2009751978 is about 44830.2573938629. The cubic root of 2009751978 is about 1261.9655176127.

The spelling of 2009751978 in words is "two billion, nine million, seven hundred fifty-one thousand, nine hundred seventy-eight".