77770077 has 16 divisors (see below), whose sum is σ = 129280512. Its totient is φ = 40399920.

The previous prime is 77770057. The next prime is 77770079. The reversal of 77770077 is 77007777.

It is not a de Polignac number, because 77770077 - 2⁶ = 77770013 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77770079) 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, 168103 + ... + 168564.

It is an arithmetic number, because the mean of its divisors is an integer number (8080032).

Almost surely, 2^77770077 is an apocalyptic number.

77770077 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

77770077 is a deficient number, since it is larger than the sum of its proper divisors (51510435).

77770077 is a wasteful number, since it uses less digits than its factorization.

77770077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336688.

The product of its (nonzero) digits is 117649, while the sum is 42.

The square root of 77770077 is about 8818.7344330125. The cubic root of 77770077 is about 426.8456334038.

It can be divided in two parts, 777700 and 77, that added together give a palindrome (777777).

The spelling of 77770077 in words is "seventy-seven million, seven hundred seventy thousand, seventy-seven".