77660505 has 128 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 33841152.

The previous prime is 77660491. The next prime is 77660509. The reversal of 77660505 is 50506677.

It is not a de Polignac number, because 77660505 - 2⁷ = 77660377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77660505.

It is not an unprimeable number, because it can be changed into a prime (77660509) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 566797 + ... + 566933.

It is an arithmetic number, because the mean of its divisors is an integer number (1304100).

Almost surely, 2^77660505 is an apocalyptic number.

It is an amenable number.

77660505 is an abundant number, since it is smaller than the sum of its proper divisors (89264295).

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

77660505 is a wasteful number, since it uses less digits than its factorization.

77660505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 77660505 is about 8812.5197872118. The cubic root of 77660505 is about 426.6450750657.

The spelling of 77660505 in words is "seventy-seven million, six hundred sixty thousand, five hundred five".