999787968 has 56 divisors (see below), whose sum is σ = 2939196560. Its totient is φ = 333262080.

The previous prime is 999787967. The next prime is 999787979. The reversal of 999787968 is 869787999.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 999787896 and 999787905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999787967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287563 + ... + 291018.

Almost surely, 2^999787968 is an apocalyptic number.

It is an amenable number.

999787968 is an abundant number, since it is smaller than the sum of its proper divisors (1939408592).

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

999787968 is a wasteful number, since it uses less digits than its factorization.

999787968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578602 (or 578586 counting only the distinct ones).

The product of its digits is 123451776, while the sum is 72.

The square root of 999787968 is about 31619.4239036704. The cubic root of 999787968 is about 999.9293176708.

The spelling of 999787968 in words is "nine hundred ninety-nine million, seven hundred eighty-seven thousand, nine hundred sixty-eight".