647999038 has 4 divisors (see below), whose sum is σ = 971998560. Its totient is φ = 323999518.

The previous prime is 647999017. The next prime is 647999039. The reversal of 647999038 is 830999746.

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

It is a self number, because there is not a number n which added to its sum of digits gives 647999038.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647999039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161999758 + ... + 161999761.

It is an arithmetic number, because the mean of its divisors is an integer number (242999640).

Almost surely, 2^647999038 is an apocalyptic number.

647999038 is a deficient number, since it is larger than the sum of its proper divisors (323999522).

647999038 is a wasteful number, since it uses less digits than its factorization.

647999038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323999521.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 647999038 is about 25455.8252272442. The cubic root of 647999038 is about 865.3493139607.

It can be divided in two parts, 64799 and 9038, that added together give a palindrome (73837).

The spelling of 647999038 in words is "six hundred forty-seven million, nine hundred ninety-nine thousand, thirty-eight".