647399049 has 32 divisors (see below), whose sum is σ = 1007427456. Its totient is φ = 365445120.

The previous prime is 647399041. The next prime is 647399063. The reversal of 647399049 is 940993746.

It is not a de Polignac number, because 647399049 - 2³ = 647399041 is a prime.

It is a super-2 number, since 2×647399049² = 838251057292208802, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 647398992 and 647399010.

It is not an unprimeable number, because it can be changed into a prime (647399041) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 48469 + ... + 60365.

It is an arithmetic number, because the mean of its divisors is an integer number (31482108).

Almost surely, 2^647399049 is an apocalyptic number.

It is an amenable number.

647399049 is a deficient number, since it is larger than the sum of its proper divisors (360028407).

647399049 is a wasteful number, since it uses less digits than its factorization.

647399049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12025.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 647399049 is about 25444.0375923319. The cubic root of 647399049 is about 865.0821528665.

The spelling of 647399049 in words is "six hundred forty-seven million, three hundred ninety-nine thousand, forty-nine".