670387665 has 16 divisors (see below), whose sum is σ = 1073112768. Its totient is φ = 357375936.

The previous prime is 670387643. The next prime is 670387699. The reversal of 670387665 is 566783076.

It is not a de Polignac number, because 670387665 - 2⁵ = 670387633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28134 + ... + 46176.

It is an arithmetic number, because the mean of its divisors is an integer number (67069548).

Almost surely, 2^670387665 is an apocalyptic number.

It is an amenable number.

670387665 is a deficient number, since it is larger than the sum of its proper divisors (402725103).

670387665 is a wasteful number, since it uses less digits than its factorization.

670387665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20528.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The square root of 670387665 is about 25891.8455309775. The cubic root of 670387665 is about 875.2027459434.

The spelling of 670387665 in words is "six hundred seventy million, three hundred eighty-seven thousand, six hundred sixty-five".