647717890 has 16 divisors (see below), whose sum is σ = 1179940608. Its totient is φ = 255965296.

The previous prime is 647717879. The next prime is 647717897. The reversal of 647717890 is 98717746.

It is not an unprimeable number, because it can be changed into a prime (647717897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389362 + ... + 391021.

It is an arithmetic number, because the mean of its divisors is an integer number (73746288).

Almost surely, 2^647717890 is an apocalyptic number.

647717890 is a deficient number, since it is larger than the sum of its proper divisors (532222718).

647717890 is a wasteful number, since it uses less digits than its factorization.

647717890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780473.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 647717890 is about 25450.3023557678. The cubic root of 647717890 is about 865.2241458618.

The spelling of 647717890 in words is "six hundred forty-seven million, seven hundred seventeen thousand, eight hundred ninety".