123638672298 has 16 divisors (see below), whose sum is σ = 260291941920. Its totient is φ = 39043791216.

The previous prime is 123638672291. The next prime is 123638672299. The reversal of 123638672298 is 892276836321.

It is a super-2 number, since 2×123638672298² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (123638672291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542274765 + ... + 542274992.

It is an arithmetic number, because the mean of its divisors is an integer number (16268246370).

Almost surely, 2^123638672298 is an apocalyptic number.

123638672298 is an abundant number, since it is smaller than the sum of its proper divisors (136653269622).

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

123638672298 is a wasteful number, since it uses less digits than its factorization.

123638672298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084549781.

The product of its digits is 10450944, while the sum is 57.

The spelling of 123638672298 in words is "one hundred twenty-three billion, six hundred thirty-eight million, six hundred seventy-two thousand, two hundred ninety-eight".