1990636263 has 128 divisors (see below), whose sum is σ = 3860398080. Its totient is φ = 983664000.

The previous prime is 1990636253. The next prime is 1990636273. The reversal of 1990636263 is 3626360991.

It is a happy number.

1990636263 is a `hidden beast` number, since 1 + 9 + 9 + 0 + 636 + 2 + 6 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1990636253) and next prime (1990636273).

It is not a de Polignac number, because 1990636263 - 2⁴ = 1990636247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990636243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4317853 + ... + 4318313.

It is an arithmetic number, because the mean of its divisors is an integer number (30159360).

Almost surely, 2^1990636263 is an apocalyptic number.

1990636263 is a deficient number, since it is larger than the sum of its proper divisors (1869761817).

1990636263 is a wasteful number, since it uses less digits than its factorization.

1990636263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 45.

The square root of 1990636263 is about 44616.5469641029. The cubic root of 1990636263 is about 1257.9517117370.

It can be divided in two parts, 19906 and 36263, that added together give a square (56169 = 237²).

The spelling of 1990636263 in words is "one billion, nine hundred ninety million, six hundred thirty-six thousand, two hundred sixty-three".