77227639 has 4 divisors (see below), whose sum is σ = 77306560. Its totient is φ = 77148720.

The previous prime is 77227597. The next prime is 77227643. The reversal of 77227639 is 93672277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93672277 = 149 ⋅628673.

It is a cyclic number.

It is not a de Polignac number, because 77227639 - 2⁹ = 77227127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77227595 and 77227604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77225639) 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, 37974 + ... + 39955.

It is an arithmetic number, because the mean of its divisors is an integer number (19326640).

Almost surely, 2^77227639 is an apocalyptic number.

77227639 is a deficient number, since it is larger than the sum of its proper divisors (78921).

77227639 is an equidigital number, since it uses as much as digits as its factorization.

77227639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78920.

The product of its digits is 222264, while the sum is 43.

The square root of 77227639 is about 8787.9257507105. The cubic root of 77227639 is about 425.8509161882.

The spelling of 77227639 in words is "seventy-seven million, two hundred twenty-seven thousand, six hundred thirty-nine".