647320389 has 8 divisors (see below), whose sum is σ = 863270592. Its totient is φ = 431458560.

The previous prime is 647320369. The next prime is 647320411. The reversal of 647320389 is 983023746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647320389 - 2¹⁵ = 647287621 is a prime.

It is a super-2 number, since 2×647320389² = 838047372030222642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647320389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647320309) 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, 2524 + ... + 36069.

It is an arithmetic number, because the mean of its divisors is an integer number (107908824).

Almost surely, 2^647320389 is an apocalyptic number.

It is an amenable number.

647320389 is a deficient number, since it is larger than the sum of its proper divisors (215950203).

647320389 is a wasteful number, since it uses less digits than its factorization.

647320389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44187.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 647320389 is about 25442.4918001362. The cubic root of 647320389 is about 865.0471151679.

It can be divided in two parts, 6473 and 20389, that added together give a palindrome (26862).

The spelling of 647320389 in words is "six hundred forty-seven million, three hundred twenty thousand, three hundred eighty-nine".