688562494 has 4 divisors (see below), whose sum is σ = 1032843744. Its totient is φ = 344281246.

The previous prime is 688562471. The next prime is 688562503. The reversal of 688562494 is 494265886.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 172140622 + ... + 172140625.

It is an arithmetic number, because the mean of its divisors is an integer number (258210936).

Almost surely, 2^688562494 is an apocalyptic number.

688562494 is a deficient number, since it is larger than the sum of its proper divisors (344281250).

688562494 is a wasteful number, since it uses less digits than its factorization.

688562494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344281249.

The product of its digits is 3317760, while the sum is 52.

The square root of 688562494 is about 26240.4743478467. The cubic root of 688562494 is about 883.0415133191.

The spelling of 688562494 in words is "six hundred eighty-eight million, five hundred sixty-two thousand, four hundred ninety-four".