684252387 has 32 divisors (see below), whose sum is σ = 1247644160. Its totient is φ = 360923040.

The previous prime is 684252379. The next prime is 684252407. The reversal of 684252387 is 783252486.

684252387 is a `hidden beast` number, since 6 + 8 + 42 + 523 + 87 = 666.

684252387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684252387 - 2³ = 684252379 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (684252487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136789 + ... + 141702.

It is an arithmetic number, because the mean of its divisors is an integer number (38988880).

Almost surely, 2^684252387 is an apocalyptic number.

684252387 is a deficient number, since it is larger than the sum of its proper divisors (563391773).

684252387 is a wasteful number, since it uses less digits than its factorization.

684252387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278520 (or 278514 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 684252387 is about 26158.2183452926. The cubic root of 684252387 is about 881.1951679782.

Subtracting 684252387 from its reverse (783252486), we obtain a palindrome (99000099).

The spelling of 684252387 in words is "six hundred eighty-four million, two hundred fifty-two thousand, three hundred eighty-seven".