123631664 has 40 divisors (see below), whose sum is σ = 259170912. Its totient is φ = 56793600.

The previous prime is 123631637. The next prime is 123631699. The reversal of 123631664 is 466136321.

It is a self number, because there is not a number n which added to its sum of digits gives 123631664.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47189 + ... + 49739.

Almost surely, 2^123631664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123631664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129585456).

123631664 is an abundant number, since it is smaller than the sum of its proper divisors (135539248).

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

123631664 is a wasteful number, since it uses less digits than its factorization.

123631664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805 (or 2799 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 123631664 is about 11118.9776508454. The cubic root of 123631664 is about 498.1688539953.

Adding to 123631664 its reverse (466136321), we get a palindrome (589767985).

The spelling of 123631664 in words is "one hundred twenty-three million, six hundred thirty-one thousand, six hundred sixty-four".