647404261 has 8 divisors (see below), whose sum is σ = 740223360. Its totient is φ = 554668368.

The previous prime is 647404229. The next prime is 647404267. The reversal of 647404261 is 162404746.

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 647404261 - 2⁵ = 647404229 is a prime.

It is a super-2 number, since 2×647404261² = 838264554321912242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647404267) 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, 3121 + ... + 36118.

It is an arithmetic number, because the mean of its divisors is an integer number (92527920).

Almost surely, 2^647404261 is an apocalyptic number.

It is an amenable number.

647404261 is a deficient number, since it is larger than the sum of its proper divisors (92819099).

647404261 is a wasteful number, since it uses less digits than its factorization.

647404261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41603.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 647404261 is about 25444.1400129774. The cubic root of 647404261 is about 865.0844743590.

The spelling of 647404261 in words is "six hundred forty-seven million, four hundred four thousand, two hundred sixty-one".