647602081 has 6 divisors (see below), whose sum is σ = 753333090. Its totient is φ = 555087456.

The previous prime is 647602079. The next prime is 647602091. The reversal of 647602081 is 180206746.

It can be written as a sum of positive squares in only one way, i.e., 566440000 + 81162081 = 23800^2 + 9009^2 .

It is not a de Polignac number, because 647602081 - 2¹ = 647602079 is a prime.

It is a super-2 number, since 2×647602081² = 838776910631061122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647602091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6608136 + ... + 6608233.

It is an arithmetic number, because the mean of its divisors is an integer number (125555515).

Almost surely, 2^647602081 is an apocalyptic number.

It is an amenable number.

647602081 is a deficient number, since it is larger than the sum of its proper divisors (105731009).

647602081 is a wasteful number, since it uses less digits than its factorization.

647602081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13216383 (or 13216376 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 647602081 is about 25448.0270551569. The cubic root of 647602081 is about 865.1725767466.

The spelling of 647602081 in words is "six hundred forty-seven million, six hundred two thousand, eighty-one".