1068631638 has 16 divisors (see below), whose sum is σ = 2140148736. Its totient is φ = 355729640.

The previous prime is 1068631631. The next prime is 1068631699. The reversal of 1068631638 is 8361368601.

It is a super-2 number, since 2×1068631638² = 2283947155469126088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1068631638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1068631631) 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, 115398 + ... + 124313.

It is an arithmetic number, because the mean of its divisors is an integer number (133759296).

Almost surely, 2^1068631638 is an apocalyptic number.

1068631638 is an abundant number, since it is smaller than the sum of its proper divisors (1071517098).

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

1068631638 is a wasteful number, since it uses less digits than its factorization.

1068631638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240459.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1068631638 is about 32689.9317527584. The cubic root of 1068631638 is about 1022.3729316852.

It can be divided in two parts, 10686 and 31638, that added together give a palindrome (42324).

The spelling of 1068631638 in words is "one billion, sixty-eight million, six hundred thirty-one thousand, six hundred thirty-eight".