688216392 has 32 divisors (see below), whose sum is σ = 1911712800. Its totient is φ = 229405392.

The previous prime is 688216387. The next prime is 688216393. The reversal of 688216392 is 293612886.

688216392 is a `hidden beast` number, since 6 + 8 + 8 + 2 + 1 + 639 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (688216393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1592878 + ... + 1593309.

It is an arithmetic number, because the mean of its divisors is an integer number (59741025).

Almost surely, 2^688216392 is an apocalyptic number.

It is an amenable number.

688216392 is an abundant number, since it is smaller than the sum of its proper divisors (1223496408).

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

688216392 is a wasteful number, since it uses less digits than its factorization.

688216392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3186202 (or 3186192 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 688216392 is about 26233.8787067410. The cubic root of 688216392 is about 882.8935366008.

The spelling of 688216392 in words is "six hundred eighty-eight million, two hundred sixteen thousand, three hundred ninety-two".