805780078 has 4 divisors (see below), whose sum is σ = 1208670120. Its totient is φ = 402890038.

The previous prime is 805780069. The next prime is 805780097. The reversal of 805780078 is 870087508.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201445018 + ... + 201445021.

It is an arithmetic number, because the mean of its divisors is an integer number (302167530).

Almost surely, 2^805780078 is an apocalyptic number.

805780078 is a deficient number, since it is larger than the sum of its proper divisors (402890042).

805780078 is a wasteful number, since it uses less digits than its factorization.

805780078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402890041.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 805780078 is about 28386.2656578846. The cubic root of 805780078 is about 930.5481325709.

The spelling of 805780078 in words is "eight hundred five million, seven hundred eighty thousand, seventy-eight".