1990870636 has 24 divisors (see below), whose sum is σ = 3500771456. Its totient is φ = 990662400.

The previous prime is 1990870591. The next prime is 1990870643. The reversal of 1990870636 is 6360780991.

It is a self number, because there is not a number n which added to its sum of digits gives 1990870636.

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, 1019461 + ... + 1021411.

Almost surely, 2^1990870636 is an apocalyptic number.

It is an amenable number.

1990870636 is a deficient number, since it is larger than the sum of its proper divisors (1509900820).

1990870636 is a wasteful number, since it uses less digits than its factorization.

1990870636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049 (or 3047 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 1990870636 is about 44619.1734123347. The cubic root of 1990870636 is about 1258.0010792603.

The spelling of 1990870636 in words is "one billion, nine hundred ninety million, eight hundred seventy thousand, six hundred thirty-six".