77781480108 has 24 divisors (see below), whose sum is σ = 181566732480. Its totient is φ = 25916215440.

The previous prime is 77781480097. The next prime is 77781480143. The reversal of 77781480108 is 80108418777.

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, 1338438 + ... + 1395341.

It is an arithmetic number, because the mean of its divisors is an integer number (7565280520).

Almost surely, 2^77781480108 is an apocalyptic number.

It is an amenable number.

77781480108 is an abundant number, since it is smaller than the sum of its proper divisors (103785252372).

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

77781480108 is a wasteful number, since it uses less digits than its factorization.

77781480108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736157 (or 2736155 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 51.

The spelling of 77781480108 in words is "seventy-seven billion, seven hundred eighty-one million, four hundred eighty thousand, one hundred eight".