688005434 has 4 divisors (see below), whose sum is σ = 1032008154. Its totient is φ = 344002716.

The previous prime is 688005433. The next prime is 688005449. The reversal of 688005434 is 434500886.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 623251225 + 64754209 = 24965^2 + 8047^2 .

It is not an unprimeable number, because it can be changed into a prime (688005433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172001357 + ... + 172001360.

Almost surely, 2^688005434 is an apocalyptic number.

688005434 is a deficient number, since it is larger than the sum of its proper divisors (344002720).

688005434 is a wasteful number, since it uses less digits than its factorization.

688005434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344002719.

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 688005434 is about 26229.8576816574. The cubic root of 688005434 is about 882.8033166783.

The spelling of 688005434 in words is "six hundred eighty-eight million, five thousand, four hundred thirty-four".