670439578 has 4 divisors (see below), whose sum is σ = 1005659370. Its totient is φ = 335219788.

The previous prime is 670439551. The next prime is 670439579. The reversal of 670439578 is 875934076.

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., 392317249 + 278122329 = 19807^2 + 16677^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (670439579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167609893 + ... + 167609896.

Almost surely, 2^670439578 is an apocalyptic number.

670439578 is a deficient number, since it is larger than the sum of its proper divisors (335219792).

670439578 is a wasteful number, since it uses less digits than its factorization.

670439578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335219791.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 670439578 is about 25892.8480086683. The cubic root of 670439578 is about 875.2253364681.

The spelling of 670439578 in words is "six hundred seventy million, four hundred thirty-nine thousand, five hundred seventy-eight".