647670690 has 24 divisors (see below), whose sum is σ = 1683944028. Its totient is φ = 172712160.

The previous prime is 647670637. The next prime is 647670691. The reversal of 647670690 is 96076746.

647670690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 557857161 + 89813529 = 23619^2 + 9477^2 .

It is a super-2 number, since 2×647670690² = 838954645370152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (647670691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3598081 + ... + 3598260.

Almost surely, 2^647670690 is an apocalyptic number.

647670690 is an abundant number, since it is smaller than the sum of its proper divisors (1036273338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647670690 is a wasteful number, since it uses less digits than its factorization.

647670690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7196354 (or 7196351 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 647670690 is about 25449.3750414426. The cubic root of 647670690 is about 865.2031287018.

The spelling of 647670690 in words is "six hundred forty-seven million, six hundred seventy thousand, six hundred ninety".