688383378 has 12 divisors (see below), whose sum is σ = 1491497358. Its totient is φ = 229461120.

The previous prime is 688383331. The next prime is 688383413. The reversal of 688383378 is 873383886.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 381538089 + 306845289 = 19533^2 + 17517^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19121743 + ... + 19121778.

Almost surely, 2^688383378 is an apocalyptic number.

688383378 is an abundant number, since it is smaller than the sum of its proper divisors (803113980).

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

688383378 is a wasteful number, since it uses less digits than its factorization.

688383378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38243529 (or 38243526 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 688383378 is about 26237.0611540241. The cubic root of 688383378 is about 882.9649380473.

The spelling of 688383378 in words is "six hundred eighty-eight million, three hundred eighty-three thousand, three hundred seventy-eight".