100023129978 has 16 divisors (see below), whose sum is σ = 210575010720. Its totient is φ = 31586251536.

The previous prime is 100023129971. The next prime is 100023129989. The reversal of 100023129978 is 879921320001.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100023129971) 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, 438697825 + ... + 438698052.

It is an arithmetic number, because the mean of its divisors is an integer number (13160938170).

Almost surely, 2^100023129978 is an apocalyptic number.

100023129978 is an abundant number, since it is smaller than the sum of its proper divisors (110551880742).

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

100023129978 is a wasteful number, since it uses less digits than its factorization.

100023129978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877395901.

The product of its (nonzero) digits is 54432, while the sum is 42.

Adding to 100023129978 its reverse (879921320001), we get a palindrome (979944449979).

The spelling of 100023129978 in words is "one hundred billion, twenty-three million, one hundred twenty-nine thousand, nine hundred seventy-eight".