647597381 has 8 divisors (see below), whose sum is σ = 656949504. Its totient is φ = 638258400.

The previous prime is 647597341. The next prime is 647597399. The reversal of 647597381 is 183795746.

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 647597381 - 2¹⁰ = 647596357 is a prime.

It is a super-2 number, since 2×647597381² = 838764735756118322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647597341) 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, 140150 + ... + 144696.

It is an arithmetic number, because the mean of its divisors is an integer number (82118688).

Almost surely, 2^647597381 is an apocalyptic number.

It is an amenable number.

647597381 is a deficient number, since it is larger than the sum of its proper divisors (9352123).

647597381 is a wasteful number, since it uses less digits than its factorization.

647597381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6571.

The product of its digits is 1270080, while the sum is 50.

The square root of 647597381 is about 25447.9347099131. The cubic root of 647597381 is about 865.1704837325.

The spelling of 647597381 in words is "six hundred forty-seven million, five hundred ninety-seven thousand, three hundred eighty-one".