647321498 has 4 divisors (see below), whose sum is σ = 970982250. Its totient is φ = 323660748.

The previous prime is 647321491. The next prime is 647321513. The reversal of 647321498 is 894123746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 516516529 + 130804969 = 22727^2 + 11437^2 .

It is not an unprimeable number, because it can be changed into a prime (647321491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161830373 + ... + 161830376.

Almost surely, 2^647321498 is an apocalyptic number.

647321498 is a deficient number, since it is larger than the sum of its proper divisors (323660752).

647321498 is a wasteful number, since it uses less digits than its factorization.

647321498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323660751.

The product of its digits is 290304, while the sum is 44.

The square root of 647321498 is about 25442.5135943759. The cubic root of 647321498 is about 865.0476091719.

The spelling of 647321498 in words is "six hundred forty-seven million, three hundred twenty-one thousand, four hundred ninety-eight".