647098 has 4 divisors (see below), whose sum is σ = 970650. Its totient is φ = 323548.

The previous prime is 647081. The next prime is 647099. The reversal of 647098 is 890746.

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., 567009 + 80089 = 753^2 + 283^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (647099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161773 + ... + 161776.

2⁶⁴⁷⁰⁹⁸ is an apocalyptic number.

647098 is a deficient number, since it is larger than the sum of its proper divisors (323552).

647098 is a wasteful number, since it uses less digits than its factorization.

647098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323551.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 647098 is about 804.4240175430. The cubic root of 647098 is about 86.4948040582.

The spelling of 647098 in words is "six hundred forty-seven thousand, ninety-eight".