77505069 has 4 divisors (see below), whose sum is σ = 103340096. Its totient is φ = 51670044.

The previous prime is 77505061. The next prime is 77505097. The reversal of 77505069 is 96050577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77505069 - 2³ = 77505061 is a prime.

It is a super-2 number, since 2×77505069² = 12014071441389522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77505061) by changing a digit.

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, 12917509 + ... + 12917514.

It is an arithmetic number, because the mean of its divisors is an integer number (25835024).

Almost surely, 2^77505069 is an apocalyptic number.

It is an amenable number.

77505069 is a deficient number, since it is larger than the sum of its proper divisors (25835027).

77505069 is a wasteful number, since it uses less digits than its factorization.

77505069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25835026.

The product of its (nonzero) digits is 66150, while the sum is 39.

The square root of 77505069 is about 8803.6963259758. The cubic root of 77505069 is about 426.3602443290.

The spelling of 77505069 in words is "seventy-seven million, five hundred five thousand, sixty-nine".