647902 has 4 divisors (see below), whose sum is σ = 971856. Its totient is φ = 323950.

The previous prime is 647893. The next prime is 647909. The reversal of 647902 is 209746.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647909) by changing a digit.

647902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161974 + ... + 161977.

It is an arithmetic number, because the mean of its divisors is an integer number (242964).

2⁶⁴⁷⁹⁰² is an apocalyptic number.

647902 is a deficient number, since it is larger than the sum of its proper divisors (323954).

647902 is a wasteful number, since it uses less digits than its factorization.

647902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323953.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 647902 is about 804.9235988589. The cubic root of 647902 is about 86.5306116387.

The spelling of 647902 in words is "six hundred forty-seven thousand, nine hundred two".