77877145 has 4 divisors (see below), whose sum is σ = 93452580. Its totient is φ = 62301712.

The previous prime is 77877139. The next prime is 77877179. The reversal of 77877145 is 54177877.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57274624 + 20602521 = 7568^2 + 4539^2 .

It is a cyclic number.

It is not a de Polignac number, because 77877145 - 2¹¹ = 77875097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77877095 and 77877104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7787710 + ... + 7787719.

It is an arithmetic number, because the mean of its divisors is an integer number (23363145).

Almost surely, 2^77877145 is an apocalyptic number.

It is an amenable number.

77877145 is a deficient number, since it is larger than the sum of its proper divisors (15575435).

77877145 is a wasteful number, since it uses less digits than its factorization.

77877145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15575434.

The product of its digits is 384160, while the sum is 46.

The square root of 77877145 is about 8824.8028306586. The cubic root of 77877145 is about 427.0414265815.

The spelling of 77877145 in words is "seventy-seven million, eight hundred seventy-seven thousand, one hundred forty-five".