77138783 has 4 divisors (see below), whose sum is σ = 78446280. Its totient is φ = 75831288.

The previous prime is 77138777. The next prime is 77138791. The reversal of 77138783 is 38783177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38783177 = 227 ⋅170851.

It is a cyclic number.

It is not a de Polignac number, because 77138783 - 2⁴ = 77138767 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 (77138773) 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, 653660 + ... + 653777.

It is an arithmetic number, because the mean of its divisors is an integer number (19611570).

Almost surely, 2^77138783 is an apocalyptic number.

77138783 is a deficient number, since it is larger than the sum of its proper divisors (1307497).

77138783 is a wasteful number, since it uses less digits than its factorization.

77138783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307496.

The product of its digits is 197568, while the sum is 44.

The square root of 77138783 is about 8782.8687226896. The cubic root of 77138783 is about 425.6875293873.

The spelling of 77138783 in words is "seventy-seven million, one hundred thirty-eight thousand, seven hundred eighty-three".