77663 has 4 divisors (see below), whose sum is σ = 79800. Its totient is φ = 75528.

The previous prime is 77659. The next prime is 77681. The reversal of 77663 is 36677.

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 77663 - 2² = 77659 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77263) 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, 1013 + ... + 1086.

It is an arithmetic number, because the mean of its divisors is an integer number (19950).

2⁷⁷⁶⁶³ is an apocalyptic number.

77663 is a deficient number, since it is larger than the sum of its proper divisors (2137).

77663 is a wasteful number, since it uses less digits than its factorization.

77663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136.

The product of its digits is 5292, while the sum is 29.

The square root of 77663 is about 278.6808210121. The cubic root of 77663 is about 42.6649643961.

The spelling of 77663 in words is "seventy-seven thousand, six hundred sixty-three".