78954521406 has 16 divisors (see below), whose sum is σ = 159683302800. Its totient is φ = 26022463808.

The previous prime is 78954521369. The next prime is 78954521407. The reversal of 78954521406 is 60412545987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78954521407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73926921 + ... + 73927988.

It is an arithmetic number, because the mean of its divisors is an integer number (9980206425).

Almost surely, 2^78954521406 is an apocalyptic number.

78954521406 is an abundant number, since it is smaller than the sum of its proper divisors (80728781394).

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

78954521406 is a wasteful number, since it uses less digits than its factorization.

78954521406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147855003.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 78954521406 in words is "seventy-eight billion, nine hundred fifty-four million, five hundred twenty-one thousand, four hundred six".