77520277312 has 28 divisors (see below), whose sum is σ = 153884810340. Its totient is φ = 38746151936.

The previous prime is 77520277301. The next prime is 77520277333. The reversal of 77520277312 is 21377202577.

It can be written as a sum of positive squares in 2 ways, for example, as 69198459136 + 8321818176 = 263056^2 + 91224^2 .

It is a congruent number.

It is an unprimeable number.

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, 38653 + ... + 395644.

Almost surely, 2^77520277312 is an apocalyptic number.

It is an amenable number.

77520277312 is a deficient number, since it is larger than the sum of its proper divisors (76364533028).

77520277312 is a wasteful number, since it uses less digits than its factorization.

77520277312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437098 (or 437088 counting only the distinct ones).

The product of its (nonzero) digits is 288120, while the sum is 43.

Adding to 77520277312 its reverse (21377202577), we get a palindrome (98897479889).

The spelling of 77520277312 in words is "seventy-seven billion, five hundred twenty million, two hundred seventy-seven thousand, three hundred twelve".