647719867 has 8 divisors (see below), whose sum is σ = 650612592. Its totient is φ = 644834400.

The previous prime is 647719847. The next prime is 647719883. The reversal of 647719867 is 768917746.

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 647719867 - 2¹⁵ = 647687099 is a prime.

It is a super-2 number, since 2×647719867² = 839082052212995378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647719847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245817 + ... + 248437.

It is an arithmetic number, because the mean of its divisors is an integer number (81326574).

Almost surely, 2^647719867 is an apocalyptic number.

647719867 is a deficient number, since it is larger than the sum of its proper divisors (2892725).

647719867 is a wasteful number, since it uses less digits than its factorization.

647719867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629.

The product of its digits is 3556224, while the sum is 55.

The square root of 647719867 is about 25450.3411961412. The cubic root of 647719867 is about 865.2250261558.

The spelling of 647719867 in words is "six hundred forty-seven million, seven hundred nineteen thousand, eight hundred sixty-seven".