81870180078 has 16 divisors (see below), whose sum is σ = 163743320016. Its totient is φ = 27289566720.

The previous prime is 81870180011. The next prime is 81870180083. The reversal of 81870180078 is 87008107818.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421198 + ... + 584078.

It is an arithmetic number, because the mean of its divisors is an integer number (10233957501).

Almost surely, 2^81870180078 is an apocalyptic number.

81870180078 is an abundant number, since it is smaller than the sum of its proper divisors (81873139938).

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

81870180078 is a wasteful number, since it uses less digits than its factorization.

81870180078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246659.

The product of its (nonzero) digits is 200704, while the sum is 48.

The spelling of 81870180078 in words is "eighty-one billion, eight hundred seventy million, one hundred eighty thousand, seventy-eight".