647803990 has 8 divisors (see below), whose sum is σ = 1166047200. Its totient is φ = 259121592.

The previous prime is 647803951. The next prime is 647803997. The reversal of 647803990 is 99308746.

647803990 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 self number, because there is not a number n which added to its sum of digits gives 647803990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647803997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32390190 + ... + 32390209.

It is an arithmetic number, because the mean of its divisors is an integer number (145755900).

Almost surely, 2^647803990 is an apocalyptic number.

647803990 is a deficient number, since it is larger than the sum of its proper divisors (518243210).

647803990 is a wasteful number, since it uses less digits than its factorization.

647803990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64780406.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 647803990 is about 25451.9938315253. The cubic root of 647803990 is about 865.2624817379.

The spelling of 647803990 in words is "six hundred forty-seven million, eight hundred three thousand, nine hundred ninety".