647890 has 16 divisors (see below), whose sum is σ = 1184832. Its totient is φ = 255024.

The previous prime is 647861. The next prime is 647891. The reversal of 647890 is 98746.

647890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×647890² = 839522904200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647891) 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, 187 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (74052).

2⁶⁴⁷⁸⁹⁰ is an apocalyptic number.

647890 is a deficient number, since it is larger than the sum of its proper divisors (536942).

647890 is a wasteful number, since it uses less digits than its factorization.

647890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 647890 is about 804.9161447008. The cubic root of 647890 is about 86.5300774150.

The spelling of 647890 in words is "six hundred forty-seven thousand, eight hundred ninety".