388775556 has 72 divisors (see below), whose sum is σ = 1083001920. Its totient is φ = 116835264.

The previous prime is 388775531. The next prime is 388775561. The reversal of 388775556 is 655577883.

388775556 is a `hidden beast` number, since 3 + 8 + 87 + 7 + 5 + 556 = 666.

It is a super-2 number, since 2×388775556² = 302292865886218272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10465 + ... + 29783.

Almost surely, 2^388775556 is an apocalyptic number.

388775556 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388775556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (541500960).

388775556 is an abundant number, since it is smaller than the sum of its proper divisors (694226364).

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

388775556 is a wasteful number, since it uses less digits than its factorization.

388775556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19385 (or 19380 counting only the distinct ones).

The product of its digits is 7056000, while the sum is 54.

The square root of 388775556 is about 19717.3922210824. The cubic root of 388775556 is about 729.8489435366.

It can be divided in two parts, 38877 and 5556, that multiplied together give a palindrome (216000612).

The spelling of 388775556 in words is "three hundred eighty-eight million, seven hundred seventy-five thousand, five hundred fifty-six".