647145998 has 4 divisors (see below), whose sum is σ = 970719000. Its totient is φ = 323572998.

The previous prime is 647145931. The next prime is 647146007. The reversal of 647145998 is 899541746.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161786498 + ... + 161786501.

It is an arithmetic number, because the mean of its divisors is an integer number (242679750).

Almost surely, 2^647145998 is an apocalyptic number.

647145998 is a deficient number, since it is larger than the sum of its proper divisors (323573002).

647145998 is a wasteful number, since it uses less digits than its factorization.

647145998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323573001.

The product of its digits is 2177280, while the sum is 53.

The square root of 647145998 is about 25439.0644088968. The cubic root of 647145998 is about 864.9694256738.

The spelling of 647145998 in words is "six hundred forty-seven million, one hundred forty-five thousand, nine hundred ninety-eight".