647340491 has 8 divisors (see below), whose sum is σ = 740029920. Its totient is φ = 554704128.

The previous prime is 647340439. The next prime is 647340517. The reversal of 647340491 is 194043746.

647340491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 647340491 - 2¹⁰ = 647339467 is a prime.

It is a super-2 number, since 2×647340491² = 838099422576242162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647340091) 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, 17705 + ... + 40101.

It is an arithmetic number, because the mean of its divisors is an integer number (92503740).

Almost surely, 2^647340491 is an apocalyptic number.

647340491 is a deficient number, since it is larger than the sum of its proper divisors (92689429).

647340491 is a wasteful number, since it uses less digits than its factorization.

647340491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26533.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 647340491 is about 25442.8868448531. The cubic root of 647340491 is about 865.0560695164.

It can be divided in two parts, 6473 and 40491, that added together give a palindrome (46964).

The spelling of 647340491 in words is "six hundred forty-seven million, three hundred forty thousand, four hundred ninety-one".