670139977 has 4 divisors (see below), whose sum is σ = 721689220. Its totient is φ = 618590736.

The previous prime is 670139947. The next prime is 670139999. The reversal of 670139977 is 779931076.

670139977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52070656 + 618069321 = 7216^2 + 24861^2 .

It is a cyclic number.

It is not a de Polignac number, because 670139977 - 2⁷ = 670139849 is a prime.

It is a super-3 number, since 3×670139977³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 670139977.

It is not an unprimeable number, because it can be changed into a prime (670139947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25774602 + ... + 25774627.

It is an arithmetic number, because the mean of its divisors is an integer number (180422305).

Almost surely, 2^670139977 is an apocalyptic number.

It is an amenable number.

670139977 is a deficient number, since it is larger than the sum of its proper divisors (51549243).

670139977 is a wasteful number, since it uses less digits than its factorization.

670139977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51549242.

The product of its (nonzero) digits is 500094, while the sum is 49.

The square root of 670139977 is about 25887.0619615282. The cubic root of 670139977 is about 875.0949456699.

The spelling of 670139977 in words is "six hundred seventy million, one hundred thirty-nine thousand, nine hundred seventy-seven".