647949895 has 8 divisors (see below), whose sum is σ = 777677904. Its totient is φ = 518267904.

The previous prime is 647949853. The next prime is 647949901. The reversal of 647949895 is 598949746.

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

It is a cyclic number.

It is not a de Polignac number, because 647949895 - 2¹¹ = 647947847 is a prime.

It is a super-2 number, since 2×647949895² = 839678132861022050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42712 + ... + 55858.

It is an arithmetic number, because the mean of its divisors is an integer number (97209738).

Almost surely, 2^647949895 is an apocalyptic number.

647949895 is a deficient number, since it is larger than the sum of its proper divisors (129728009).

647949895 is a wasteful number, since it uses less digits than its factorization.

647949895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23009.

The product of its digits is 19595520, while the sum is 61.

The square root of 647949895 is about 25454.8599485442. The cubic root of 647949895 is about 865.3274379322.

The spelling of 647949895 in words is "six hundred forty-seven million, nine hundred forty-nine thousand, eight hundred ninety-five".