670021402 has 4 divisors (see below), whose sum is σ = 1005032106. Its totient is φ = 335010700.

The previous prime is 670021397. The next prime is 670021403. The reversal of 670021402 is 204120076.

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., 345625281 + 324396121 = 18591^2 + 18011^2 .

It is a Smith number, since the sum of its digits (22) 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 (670021403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167505349 + ... + 167505352.

Almost surely, 2^670021402 is an apocalyptic number.

670021402 is a deficient number, since it is larger than the sum of its proper divisors (335010704).

670021402 is a wasteful number, since it uses less digits than its factorization.

670021402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335010703.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 670021402 is about 25884.7716234855. The cubic root of 670021402 is about 875.0433293373.

Adding to 670021402 its reverse (204120076), we get a palindrome (874141478).

The spelling of 670021402 in words is "six hundred seventy million, twenty-one thousand, four hundred two".