999788011236 has 405 divisors, whose sum is σ = 3129093149091. Its totient is φ = 269107471584.

The previous prime is 999788011139. The next prime is 999788011283. The reversal of 999788011236 is 632110887999.

The square root of 999788011236 is 999894.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×999788011236² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 5585407795 + ... + 5585407973.

Almost surely, 2^999788011236 is an apocalyptic number.

999788011236 is the 999894-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999788011236

999788011236 is an abundant number, since it is smaller than the sum of its proper divisors (2129305137855).

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

999788011236 is a wasteful number, since it uses less digits than its factorization.

999788011236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The spelling of 999788011236 in words is "nine hundred ninety-nine billion, seven hundred eighty-eight million, eleven thousand, two hundred thirty-six".