77855055 has 16 divisors (see below), whose sum is σ = 124681344. Its totient is φ = 41484960.

The previous prime is 77855051. The next prime is 77855059. The reversal of 77855055 is 55055877.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77855051) and next prime (77855059).

It is not a de Polignac number, because 77855055 - 2² = 77855051 is a prime.

It is a super-2 number, since 2×77855055² = 12122819178106050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77854998 and 77855016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77855051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24720 + ... + 27690.

It is an arithmetic number, because the mean of its divisors is an integer number (7792584).

Almost surely, 2^77855055 is an apocalyptic number.

77855055 is a deficient number, since it is larger than the sum of its proper divisors (46826289).

77855055 is a wasteful number, since it uses less digits than its factorization.

77855055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726.

The product of its (nonzero) digits is 245000, while the sum is 42.

The square root of 77855055 is about 8823.5511558556. The cubic root of 77855055 is about 427.0010457261.

The spelling of 77855055 in words is "seventy-seven million, eight hundred fifty-five thousand, fifty-five".