11978282638 has 8 divisors (see below), whose sum is σ = 20534198832. Its totient is φ = 5133549696.

The previous prime is 11978282633. The next prime is 11978282639. The reversal of 11978282638 is 83628287911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978282633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427795795 + ... + 427795822.

It is an arithmetic number, because the mean of its divisors is an integer number (2566774854).

Almost surely, 2^11978282638 is an apocalyptic number.

11978282638 is a deficient number, since it is larger than the sum of its proper divisors (8555916194).

11978282638 is an equidigital number, since it uses as much as digits as its factorization.

11978282638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855591626.

The product of its digits is 2322432, while the sum is 55.

The spelling of 11978282638 in words is "eleven billion, nine hundred seventy-eight million, two hundred eighty-two thousand, six hundred thirty-eight".