647770 has 16 divisors (see below), whose sum is σ = 1175328. Its totient is φ = 257040.

The previous prime is 647753. The next prime is 647771. The reversal of 647770 is 77746.

647770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (647771) 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, 1957 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (73458).

2⁶⁴⁷⁷⁷⁰ is an apocalyptic number.

647770 is a deficient number, since it is larger than the sum of its proper divisors (527558).

647770 is a wasteful number, since it uses less digits than its factorization.

647770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 647770 is about 804.8415993225. The cubic root of 647770 is about 86.5247348155.

The spelling of 647770 in words is "six hundred forty-seven thousand, seven hundred seventy".