647125290 has 96 divisors (see below), whose sum is σ = 1949366016. Its totient is φ = 145877760.

The previous prime is 647125289. The next prime is 647125331. The reversal of 647125290 is 92521746.

647125290 is a `hidden beast` number, since 64 + 71 + 2 + 529 + 0 = 666.

It is a super-2 number, since 2×647125290² = 837542281915168200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38955 + ... + 53025.

It is an arithmetic number, because the mean of its divisors is an integer number (20305896).

Almost surely, 2^647125290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647125290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974683008).

647125290 is an abundant number, since it is smaller than the sum of its proper divisors (1302240726).

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

647125290 is a wasteful number, since it uses less digits than its factorization.

647125290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14164 (or 14161 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 647125290 is about 25438.6573938170. The cubic root of 647125290 is about 864.9601995342.

The spelling of 647125290 in words is "six hundred forty-seven million, one hundred twenty-five thousand, two hundred ninety".