4021878766 has 4 divisors (see below), whose sum is σ = 6032818152. Its totient is φ = 2010939382.

The previous prime is 4021878743. The next prime is 4021878781. The reversal of 4021878766 is 6678781204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005469690 + ... + 1005469693.

It is an arithmetic number, because the mean of its divisors is an integer number (1508204538).

Almost surely, 2^4021878766 is an apocalyptic number.

4021878766 is a deficient number, since it is larger than the sum of its proper divisors (2010939386).

4021878766 is a wasteful number, since it uses less digits than its factorization.

4021878766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010939385.

The product of its (nonzero) digits is 903168, while the sum is 49.

The square root of 4021878766 is about 63418.2841615886. The cubic root of 4021878766 is about 1590.2899891682.

The spelling of 4021878766 in words is "four billion, twenty-one million, eight hundred seventy-eight thousand, seven hundred sixty-six".