77376978878 has 4 divisors (see below), whose sum is σ = 116065468320. Its totient is φ = 38688489438.

The previous prime is 77376978871. The next prime is 77376978883. The reversal of 77376978878 is 87887967377.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 77376978799 and 77376978808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77376978871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19344244718 + ... + 19344244721.

It is an arithmetic number, because the mean of its divisors is an integer number (29016367080).

Almost surely, 2^77376978878 is an apocalyptic number.

77376978878 is a deficient number, since it is larger than the sum of its proper divisors (38688489442).

77376978878 is a wasteful number, since it uses less digits than its factorization.

77376978878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38688489441.

The product of its digits is 1394039808, while the sum is 77.

The spelling of 77376978878 in words is "seventy-seven billion, three hundred seventy-six million, nine hundred seventy-eight thousand, eight hundred seventy-eight".