1866778344 has 48 divisors (see below), whose sum is σ = 5074164420. Its totient is φ = 620006400.

The previous prime is 1866778337. The next prime is 1866778373. The reversal of 1866778344 is 4438776681.

1866778344 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1832696100 + 34082244 = 42810^2 + 5838^2 .

It is a super-2 number, since 2×1866778344² = 6969722771254764672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26857 + ... + 66744.

Almost surely, 2^1866778344 is an apocalyptic number.

It is an amenable number.

1866778344 is an abundant number, since it is smaller than the sum of its proper divisors (3207386076).

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

1866778344 is a wasteful number, since it uses less digits than its factorization.

1866778344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93890 (or 93883 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The square root of 1866778344 is about 43206.2303840546. The cubic root of 1866778344 is about 1231.3010543939.

The spelling of 1866778344 in words is "one billion, eight hundred sixty-six million, seven hundred seventy-eight thousand, three hundred forty-four".