11631642738 has 16 divisors (see below), whose sum is σ = 23264342976. Its totient is φ = 3877038000.

The previous prime is 11631642719. The next prime is 11631642739. The reversal of 11631642738 is 83724613611.

It is a happy number.

It is a super-2 number, since 2×11631642738² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11631642738.

It is not an unprimeable number, because it can be changed into a prime (11631642739) 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, 231363 + ... + 277113.

It is an arithmetic number, because the mean of its divisors is an integer number (1454021436).

Almost surely, 2^11631642738 is an apocalyptic number.

11631642738 is an abundant number, since it is smaller than the sum of its proper divisors (11632700238).

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

11631642738 is a wasteful number, since it uses less digits than its factorization.

11631642738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88129.

The product of its digits is 145152, while the sum is 42.

The spelling of 11631642738 in words is "eleven billion, six hundred thirty-one million, six hundred forty-two thousand, seven hundred thirty-eight".