1977747868 has 24 divisors (see below), whose sum is σ = 3496853024. Its totient is φ = 978696000.

The previous prime is 1977747847. The next prime is 1977747881. The reversal of 1977747868 is 8687477791.

It is a super-2 number, since 2×1977747868² = 7822973258757090848, which contains 22 as substring.

It is a congruent number.

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, 161398 + ... + 173218.

Almost surely, 2^1977747868 is an apocalyptic number.

It is an amenable number.

1977747868 is a deficient number, since it is larger than the sum of its proper divisors (1519105156).

1977747868 is a wasteful number, since it uses less digits than its factorization.

1977747868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12253 (or 12251 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 64.

The square root of 1977747868 is about 44471.8772709226. The cubic root of 1977747868 is about 1255.2309576371.

The spelling of 1977747868 in words is "one billion, nine hundred seventy-seven million, seven hundred forty-seven thousand, eight hundred sixty-eight".