388261645520 has 40 divisors (see below), whose sum is σ = 1031666659584. Its totient is φ = 133118278272.

The previous prime is 388261645483. The next prime is 388261645547. The reversal of 388261645520 is 25546162883.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346661624 + ... + 346662743.

Almost surely, 2^388261645520 is an apocalyptic number.

It is an amenable number.

388261645520 is an abundant number, since it is smaller than the sum of its proper divisors (643405014064).

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

388261645520 is a wasteful number, since it uses less digits than its factorization.

388261645520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693324387 (or 693324381 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 388261645520 in words is "three hundred eighty-eight billion, two hundred sixty-one million, six hundred forty-five thousand, five hundred twenty".