647670387 has 48 divisors (see below), whose sum is σ = 1104993792. Its totient is φ = 334313280.

The previous prime is 647670371. The next prime is 647670407. The reversal of 647670387 is 783076746.

It is not a de Polignac number, because 647670387 - 2⁴ = 647670371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647670337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86212 + ... + 93422.

It is an arithmetic number, because the mean of its divisors is an integer number (23020704).

Almost surely, 2^647670387 is an apocalyptic number.

647670387 is a deficient number, since it is larger than the sum of its proper divisors (457323405).

647670387 is a wasteful number, since it uses less digits than its factorization.

647670387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7288 (or 7281 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 48.

The square root of 647670387 is about 25449.3690884470. The cubic root of 647670387 is about 865.2029937790.

The spelling of 647670387 in words is "six hundred forty-seven million, six hundred seventy thousand, three hundred eighty-seven".