77700080778 has 16 divisors (see below), whose sum is σ = 155415872640. Its totient is φ = 25897408416.

The previous prime is 77700080749. The next prime is 77700080797. The reversal of 77700080778 is 87708000777.

It is a self number, because there is not a number n which added to its sum of digits gives 77700080778.

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, 589843 + ... + 709446.

It is an arithmetic number, because the mean of its divisors is an integer number (9713492040).

Almost surely, 2^77700080778 is an apocalyptic number.

77700080778 is an abundant number, since it is smaller than the sum of its proper divisors (77715791862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77700080778 is a wasteful number, since it uses less digits than its factorization.

77700080778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309261.

The product of its (nonzero) digits is 1075648, while the sum is 51.

The spelling of 77700080778 in words is "seventy-seven billion, seven hundred million, eighty thousand, seven hundred seventy-eight".