84128994078 has 16 divisors (see below), whose sum is σ = 168856774416. Its totient is φ = 27943200320.

The previous prime is 84128994077. The next prime is 84128994109. The reversal of 84128994078 is 87049982148.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84128994077) 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, 24947601 + ... + 24950972.

It is an arithmetic number, because the mean of its divisors is an integer number (10553548401).

Almost surely, 2^84128994078 is an apocalyptic number.

84128994078 is an abundant number, since it is smaller than the sum of its proper divisors (84727780338).

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

84128994078 is a wasteful number, since it uses less digits than its factorization.

84128994078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49898859.

The product of its (nonzero) digits is 9289728, while the sum is 60.

The spelling of 84128994078 in words is "eighty-four billion, one hundred twenty-eight million, nine hundred ninety-four thousand, seventy-eight".