77775252648 has 16 divisors (see below), whose sum is σ = 194438131680. Its totient is φ = 25925084208.

The previous prime is 77775252647. The next prime is 77775252661. The reversal of 77775252648 is 84625257777.

It is a junction number, because it is equal to n+sod(n) for n = 77775252591 and 77775252600.

It is not an unprimeable number, because it can be changed into a prime (77775252647) 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, 1620317740 + ... + 1620317787.

It is an arithmetic number, because the mean of its divisors is an integer number (12152383230).

Almost surely, 2^77775252648 is an apocalyptic number.

It is an amenable number.

77775252648 is an abundant number, since it is smaller than the sum of its proper divisors (116662879032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77775252648 is a wasteful number, since it uses less digits than its factorization.

77775252648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240635536 (or 3240635532 counting only the distinct ones).

The product of its digits is 46099200, while the sum is 60.

The spelling of 77775252648 in words is "seventy-seven billion, seven hundred seventy-five million, two hundred fifty-two thousand, six hundred forty-eight".