100079778 has 16 divisors (see below), whose sum is σ = 200339136. Its totient is φ = 33330000.

The previous prime is 100079773. The next prime is 100079797. The reversal of 100079778 is 877970001.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (100079773) 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, 403 + ... + 14153.

It is an arithmetic number, because the mean of its divisors is an integer number (12521196).

Almost surely, 2^100079778 is an apocalyptic number.

100079778 is an abundant number, since it is smaller than the sum of its proper divisors (100259358).

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

100079778 is a wasteful number, since it uses less digits than its factorization.

100079778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14969.

The product of its (nonzero) digits is 24696, while the sum is 39.

The square root of 100079778 is about 10003.9881047510. The cubic root of 100079778 is about 464.2822827766.

The spelling of 100079778 in words is "one hundred million, seventy-nine thousand, seven hundred seventy-eight".