4021777988 has 12 divisors (see below), whose sum is σ = 7051942380. Its totient is φ = 2006937312.

The previous prime is 4021777957. The next prime is 4021777993. The reversal of 4021777988 is 8897771204.

It can be written as a sum of positive squares in 2 ways, for example, as 1492895044 + 2528882944 = 38638^2 + 50288^2 .

It is a super-2 number, since 2×4021777988² = 32349396369522656288, which contains 22 as substring.

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, 985631 + ... + 989702.

It is an arithmetic number, because the mean of its divisors is an integer number (587661865).

Almost surely, 2^4021777988 is an apocalyptic number.

It is an amenable number.

4021777988 is a deficient number, since it is larger than the sum of its proper divisors (3030164392).

4021777988 is a wasteful number, since it uses less digits than its factorization.

4021777988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975846 (or 1975844 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 53.

The square root of 4021777988 is about 63417.4896065746. The cubic root of 4021777988 is about 1590.2767061901.

The spelling of 4021777988 in words is "four billion, twenty-one million, seven hundred seventy-seven thousand, nine hundred eighty-eight".