77138273 has 4 divisors (see below), whose sum is σ = 77156400. Its totient is φ = 77120148.

The previous prime is 77138227. The next prime is 77138287. The reversal of 77138273 is 37283177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37283177 = 859 ⋅43403.

It is a cyclic number.

It is not a de Polignac number, because 77138273 - 2²⁰ = 76089697 is a prime.

It is a super-2 number, since 2×77138273² = 11900626322845058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77138203) 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, 1178 + ... + 12476.

It is an arithmetic number, because the mean of its divisors is an integer number (19289100).

Almost surely, 2^77138273 is an apocalyptic number.

It is an amenable number.

77138273 is a deficient number, since it is larger than the sum of its proper divisors (18127).

77138273 is a wasteful number, since it uses less digits than its factorization.

77138273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18126.

The product of its digits is 49392, while the sum is 38.

The square root of 77138273 is about 8782.8396888478. The cubic root of 77138273 is about 425.6865912465.

The spelling of 77138273 in words is "seventy-seven million, one hundred thirty-eight thousand, two hundred seventy-three".