77808105 has 48 divisors (see below), whose sum is σ = 138625344. Its totient is φ = 40360320.

The previous prime is 77808083. The next prime is 77808121. The reversal of 77808105 is 50180877.

It is not a de Polignac number, because 77808105 - 2¹³ = 77799913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77808105.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 394867 + ... + 395063.

It is an arithmetic number, because the mean of its divisors is an integer number (2888028).

Almost surely, 2^77808105 is an apocalyptic number.

It is an amenable number.

77808105 is a deficient number, since it is larger than the sum of its proper divisors (60817239).

77808105 is a wasteful number, since it uses less digits than its factorization.

77808105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 77808105 is about 8820.8902611925. The cubic root of 77808105 is about 426.9151950372.

The spelling of 77808105 in words is "seventy-seven million, eight hundred eight thousand, one hundred five".