647666054 has 16 divisors (see below), whose sum is σ = 1120112928. Its totient is φ = 275114112.

The previous prime is 647666023. The next prime is 647666057. The reversal of 647666054 is 450666746.

It is a junction number, because it is equal to n+sod(n) for n = 647665996 and 647666014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647666057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203117 + ... + 206280.

It is an arithmetic number, because the mean of its divisors is an integer number (70007058).

Almost surely, 2^647666054 is an apocalyptic number.

647666054 is a deficient number, since it is larger than the sum of its proper divisors (472446874).

647666054 is a wasteful number, since it uses less digits than its factorization.

647666054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409519.

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 647666054 is about 25449.2839584928. The cubic root of 647666054 is about 865.2010643341.

The spelling of 647666054 in words is "six hundred forty-seven million, six hundred sixty-six thousand, fifty-four".