77955655 has 8 divisors (see below), whose sum is σ = 93658032. Its totient is φ = 62290368.

The previous prime is 77955643. The next prime is 77955673. The reversal of 77955655 is 55655977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(77955655) divides (77955655-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 77955655 - 2¹¹ = 77953607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77955599 and 77955608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4414 + ... + 13243.

It is an arithmetic number, because the mean of its divisors is an integer number (11707254).

Almost surely, 2^77955655 is an apocalyptic number.

77955655 is the 4415-th decagonal number.

77955655 is a deficient number, since it is larger than the sum of its proper divisors (15702377).

77955655 is a wasteful number, since it uses less digits than its factorization.

77955655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18545.

The product of its digits is 1653750, while the sum is 49.

The square root of 77955655 is about 8829.2499681457. The cubic root of 77955655 is about 427.1848822865.

The spelling of 77955655 in words is "seventy-seven million, nine hundred fifty-five thousand, six hundred fifty-five".