647879890 has 16 divisors (see below), whose sum is σ = 1332781632. Its totient is φ = 222130224.

The previous prime is 647879887. The next prime is 647879927. The reversal of 647879890 is 98978746.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4627644 + ... + 4627783.

It is an arithmetic number, because the mean of its divisors is an integer number (83298852).

Almost surely, 2^647879890 is an apocalyptic number.

647879890 is an abundant number, since it is smaller than the sum of its proper divisors (684901742).

647879890 is a wasteful number, since it uses less digits than its factorization.

647879890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9255441.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The square root of 647879890 is about 25453.4848301760. The cubic root of 647879890 is about 865.2962732647.

It can be divided in two parts, 6478 and 79890, that added together give a palindrome (86368).

The spelling of 647879890 in words is "six hundred forty-seven million, eight hundred seventy-nine thousand, eight hundred ninety".