77742320878 has 16 divisors (see below), whose sum is σ = 117308620800. Its totient is φ = 38639741400.

The previous prime is 77742320867. The next prime is 77742320899. The reversal of 77742320878 is 87802324777.

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, 461683 + ... + 607153.

It is an arithmetic number, because the mean of its divisors is an integer number (7331788800).

Almost surely, 2^77742320878 is an apocalyptic number.

77742320878 is a deficient number, since it is larger than the sum of its proper divisors (39566299922).

77742320878 is a wasteful number, since it uses less digits than its factorization.

77742320878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147063.

The product of its (nonzero) digits is 7375872, while the sum is 55.

The spelling of 77742320878 in words is "seventy-seven billion, seven hundred forty-two million, three hundred twenty thousand, eight hundred seventy-eight".