77452321 has 4 divisors (see below), whose sum is σ = 79341444. Its totient is φ = 75563200.

The previous prime is 77452307. The next prime is 77452327. The reversal of 77452321 is 12325477.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4161600 + 73290721 = 2040^2 + 8561^2 .

It is a cyclic number.

It is not a de Polignac number, because 77452321 - 2¹⁷ = 77321249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77452327) 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, 944500 + ... + 944581.

It is an arithmetic number, because the mean of its divisors is an integer number (19835361).

Almost surely, 2^77452321 is an apocalyptic number.

It is an amenable number.

77452321 is a deficient number, since it is larger than the sum of its proper divisors (1889123).

77452321 is a wasteful number, since it uses less digits than its factorization.

77452321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889122.

The product of its digits is 11760, while the sum is 31.

The square root of 77452321 is about 8800.7000289750. The cubic root of 77452321 is about 426.2634990264.

Adding to 77452321 its reverse (12325477), we get a palindrome (89777798).

The spelling of 77452321 in words is "seventy-seven million, four hundred fifty-two thousand, three hundred twenty-one".