647249870 has 8 divisors (see below), whose sum is σ = 1165049784. Its totient is φ = 258899944.

The previous prime is 647249861. The next prime is 647249879. The reversal of 647249870 is 78942746.

It is an interprime number because it is at equal distance from previous prime (647249861) and next prime (647249879).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647249879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32362484 + ... + 32362503.

It is an arithmetic number, because the mean of its divisors is an integer number (145631223).

Almost surely, 2^647249870 is an apocalyptic number.

647249870 is a deficient number, since it is larger than the sum of its proper divisors (517799914).

647249870 is a wasteful number, since it uses less digits than its factorization.

647249870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64724994.

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 647249870 is about 25441.1059114969. The cubic root of 647249870 is about 865.0157013199.

The spelling of 647249870 in words is "six hundred forty-seven million, two hundred forty-nine thousand, eight hundred seventy".