1977320208 has 20 divisors (see below), whose sum is σ = 5108077328. Its totient is φ = 659106720.

The previous prime is 1977320207. The next prime is 1977320227. The reversal of 1977320208 is 8020237791.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1977320207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20597038 + ... + 20597133.

Almost surely, 2^1977320208 is an apocalyptic number.

It is an amenable number.

1977320208 is an abundant number, since it is smaller than the sum of its proper divisors (3130757120).

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

1977320208 is a wasteful number, since it uses less digits than its factorization.

1977320208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41194182 (or 41194176 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 1977320208 is about 44467.0688037788. The cubic root of 1977320208 is about 1255.1404758021.

Adding to 1977320208 its reverse (8020237791), we get a palindrome (9997557999).

The spelling of 1977320208 in words is "one billion, nine hundred seventy-seven million, three hundred twenty thousand, two hundred eight".