388778265 has 32 divisors (see below), whose sum is σ = 707245440. Its totient is φ = 202523328.

The previous prime is 388778251. The next prime is 388778279. The reversal of 388778265 is 562877883.

It is an interprime number because it is at equal distance from previous prime (388778251) and next prime (388778279).

It is not a de Polignac number, because 388778265 - 2⁴ = 388778249 is a prime.

It is a super-2 number, since 2×388778265² = 302297078672820450, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 27682 + ... + 39291.

It is an arithmetic number, because the mean of its divisors is an integer number (22101420).

Almost surely, 2^388778265 is an apocalyptic number.

It is an amenable number.

388778265 is a deficient number, since it is larger than the sum of its proper divisors (318467175).

388778265 is a wasteful number, since it uses less digits than its factorization.

388778265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67030 (or 67024 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The square root of 388778265 is about 19717.4609166596. The cubic root of 388778265 is about 729.8506387359.

The spelling of 388778265 in words is "three hundred eighty-eight million, seven hundred seventy-eight thousand, two hundred sixty-five".