647666862 has 16 divisors (see below), whose sum is σ = 1322894592. Its totient is φ = 211295480.

The previous prime is 647666861. The next prime is 647666863. The reversal of 647666862 is 268666746.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (647666861) and next prime (647666863).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647666861) 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, 1148064 + ... + 1148627.

It is an arithmetic number, because the mean of its divisors is an integer number (82680912).

Almost surely, 2^647666862 is an apocalyptic number.

647666862 is an abundant number, since it is smaller than the sum of its proper divisors (675227730).

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

647666862 is a wasteful number, since it uses less digits than its factorization.

647666862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296743.

The product of its digits is 3483648, while the sum is 51.

The square root of 647666862 is about 25449.2998331978. The cubic root of 647666862 is about 865.2014241297.

The spelling of 647666862 in words is "six hundred forty-seven million, six hundred sixty-six thousand, eight hundred sixty-two".