77436321 has 4 divisors (see below), whose sum is σ = 103248432. Its totient is φ = 51624212.

The previous prime is 77436313. The next prime is 77436323. The reversal of 77436321 is 12363477.

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.

It is a cyclic number.

It is not a de Polignac number, because 77436321 - 2³ = 77436313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77436323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12906051 + ... + 12906056.

It is an arithmetic number, because the mean of its divisors is an integer number (25812108).

Almost surely, 2^77436321 is an apocalyptic number.

It is an amenable number.

77436321 is a deficient number, since it is larger than the sum of its proper divisors (25812111).

77436321 is a wasteful number, since it uses less digits than its factorization.

77436321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25812110.

The product of its digits is 21168, while the sum is 33.

The square root of 77436321 is about 8799.7909634263. The cubic root of 77436321 is about 426.2341446848.

Adding to 77436321 its reverse (12363477), we get a palindrome (89799798).

The spelling of 77436321 in words is "seventy-seven million, four hundred thirty-six thousand, three hundred twenty-one".