688631346 has 48 divisors (see below), whose sum is σ = 1650254424. Its totient is φ = 206157312.

The previous prime is 688631311. The next prime is 688631351. The reversal of 688631346 is 643136886.

688631346 is a `hidden beast` number, since 6 + 8 + 8 + 631 + 3 + 4 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 686702025 + 1929321 = 26205^2 + 1389^2 .

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, 31111 + ... + 48426.

Almost surely, 2^688631346 is an apocalyptic number.

688631346 is an abundant number, since it is smaller than the sum of its proper divisors (961623078).

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

688631346 is a wasteful number, since it uses less digits than its factorization.

688631346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79595 (or 79592 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 688631346 is about 26241.7862577988. The cubic root of 688631346 is about 883.0709452387.

The spelling of 688631346 in words is "six hundred eighty-eight million, six hundred thirty-one thousand, three hundred forty-six".