1809977768 has 32 divisors (see below), whose sum is σ = 3446150400. Its totient is φ = 891047808.

The previous prime is 1809977747. The next prime is 1809977773. The reversal of 1809977768 is 8677799081.

It is a self number, because there is not a number n which added to its sum of digits gives 1809977768.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382505 + ... + 387207.

It is an arithmetic number, because the mean of its divisors is an integer number (107692200).

Almost surely, 2^1809977768 is an apocalyptic number.

It is an amenable number.

1809977768 is a deficient number, since it is larger than the sum of its proper divisors (1636172632).

1809977768 is a wasteful number, since it uses less digits than its factorization.

1809977768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441 (or 5437 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 62.

The square root of 1809977768 is about 42543.8334897080. The cubic root of 1809977768 is about 1218.6839180545.

The spelling of 1809977768 in words is "one billion, eight hundred nine million, nine hundred seventy-seven thousand, seven hundred sixty-eight".