77421077 has 6 divisors (see below), whose sum is σ = 82243458. Its totient is φ = 72866624.

The previous prime is 77421073. The next prime is 77421089. The reversal of 77421077 is 77012477.

It can be written as a sum of positive squares in 3 ways, for example, as 43151761 + 34269316 = 6569^2 + 5854^2 .

It is not a de Polignac number, because 77421077 - 2² = 77421073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77421073) 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 5 ways as a sum of consecutive naturals, for example, 133658 + ... + 134235.

It is an arithmetic number, because the mean of its divisors is an integer number (13707243).

Almost surely, 2^77421077 is an apocalyptic number.

It is an amenable number.

77421077 is a deficient number, since it is larger than the sum of its proper divisors (4822381).

77421077 is a wasteful number, since it uses less digits than its factorization.

77421077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267927 (or 267910 counting only the distinct ones).

The product of its (nonzero) digits is 19208, while the sum is 35.

The square root of 77421077 is about 8798.9247638561. The cubic root of 77421077 is about 426.2061735741.

The spelling of 77421077 in words is "seventy-seven million, four hundred twenty-one thousand, seventy-seven".