77270321 has 16 divisors (see below), whose sum is σ = 88911360. Its totient is φ = 66666240.

The previous prime is 77270311. The next prime is 77270327. The reversal of 77270321 is 12307277.

It is a cyclic number.

It is not a de Polignac number, because 77270321 - 2¹⁸ = 77008177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77270327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6155 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (5556960).

Almost surely, 2^77270321 is an apocalyptic number.

It is an amenable number.

77270321 is a deficient number, since it is larger than the sum of its proper divisors (11641039).

77270321 is a wasteful number, since it uses less digits than its factorization.

77270321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7784.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 77270321 is about 8790.3538609091. The cubic root of 77270321 is about 425.9293545191.

Adding to 77270321 its reverse (12307277), we get a palindrome (89577598).

The spelling of 77270321 in words is "seventy-seven million, two hundred seventy thousand, three hundred twenty-one".