1990077866 has 24 divisors (see below), whose sum is σ = 3474459396. Its totient is φ = 852405120.

The previous prime is 1990077857. The next prime is 1990077889. The reversal of 1990077866 is 6687700991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1825083841 + 164994025 = 42721^2 + 12845^2 .

It is a super-2 number, since 2×1990077866² = 7920819825486227912, which contains 22 as substring.

It is a Curzon number.

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, 207080 + ... + 216476.

Almost surely, 2^1990077866 is an apocalyptic number.

1990077866 is a deficient number, since it is larger than the sum of its proper divisors (1484381530).

1990077866 is a wasteful number, since it uses less digits than its factorization.

1990077866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11574 (or 11567 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 1990077866 is about 44610.2887908160. The cubic root of 1990077866 is about 1257.8340772959.

The spelling of 1990077866 in words is "one billion, nine hundred ninety million, seventy-seven thousand, eight hundred sixty-six".