80005000078 has 16 divisors (see below), whose sum is σ = 120388815360. Its totient is φ = 39875597496.

The previous prime is 80005000069. The next prime is 80005000079. The reversal of 80005000078 is 87000050008.

80005000078 is a nontrivial binomial coefficient, being equal to C(400013, 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80005000079) 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, 750025 + ... + 850027.

It is an arithmetic number, because the mean of its divisors is an integer number (7524300960).

Almost surely, 2^80005000078 is an apocalyptic number.

80005000078 is the 400012-nd triangular number.

80005000078 is the 133338-th centered nonagonal number.

80005000078 is a deficient number, since it is larger than the sum of its proper divisors (40383815282).

80005000078 is a wasteful number, since it uses less digits than its factorization.

80005000078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101271.

The product of its (nonzero) digits is 2240, while the sum is 28.

The spelling of 80005000078 in words is "eighty billion, five million, seventy-eight", and thus it is an aban number and an uban number.