77661023 has 4 divisors (see below), whose sum is σ = 84721128. Its totient is φ = 70600920.

The previous prime is 77661019. The next prime is 77661071. The reversal of 77661023 is 32016677.

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

It is a cyclic number.

It is not a de Polignac number, because 77661023 - 2² = 77661019 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 (77661323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3530036 + ... + 3530057.

It is an arithmetic number, because the mean of its divisors is an integer number (21180282).

Almost surely, 2^77661023 is an apocalyptic number.

77661023 is a deficient number, since it is larger than the sum of its proper divisors (7060105).

77661023 is a wasteful number, since it uses less digits than its factorization.

77661023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060104.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 77661023 is about 8812.5491771678. The cubic root of 77661023 is about 426.6460236459.

The spelling of 77661023 in words is "seventy-seven million, six hundred sixty-one thousand, twenty-three".