77344621 has 4 divisors (see below), whose sum is σ = 77362432. Its totient is φ = 77326812.

The previous prime is 77344601. The next prime is 77344633. The reversal of 77344621 is 12644377.

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: 12644377 = 29 ⋅436013.

It is a cyclic number.

It is not a de Polignac number, because 77344621 - 2⁹ = 77344109 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 (77344601) 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, 2356 + ... + 12658.

It is an arithmetic number, because the mean of its divisors is an integer number (19340608).

Almost surely, 2^77344621 is an apocalyptic number.

It is an amenable number.

77344621 is a deficient number, since it is larger than the sum of its proper divisors (17811).

77344621 is a wasteful number, since it uses less digits than its factorization.

77344621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17810.

The product of its digits is 28224, while the sum is 34.

The square root of 77344621 is about 8794.5790689492. The cubic root of 77344621 is about 426.0658295706.

Adding to 77344621 its reverse (12644377), we get a palindrome (89988998).

The spelling of 77344621 in words is "seventy-seven million, three hundred forty-four thousand, six hundred twenty-one".