77380078 has 4 divisors (see below), whose sum is σ = 116070120. Its totient is φ = 38690038.

The previous prime is 77380063. The next prime is 77380087. The reversal of 77380078 is 87008377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87008377 = 6959 ⋅12503.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 77380078.

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, 19345018 + ... + 19345021.

It is an arithmetic number, because the mean of its divisors is an integer number (29017530).

Almost surely, 2^77380078 is an apocalyptic number.

77380078 is a deficient number, since it is larger than the sum of its proper divisors (38690042).

77380078 is a wasteful number, since it uses less digits than its factorization.

77380078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38690041.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 77380078 is about 8796.5946820346. The cubic root of 77380078 is about 426.1309265699.

The spelling of 77380078 in words is "seventy-seven million, three hundred eighty thousand, seventy-eight".