647788 has 6 divisors (see below), whose sum is σ = 1133636. Its totient is φ = 323892.

The previous prime is 647783. The next prime is 647789. The reversal of 647788 is 887746.

647788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 647788.

It is not an unprimeable number, because it can be changed into a prime (647783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80970 + ... + 80977.

2⁶⁴⁷⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

647788 is a deficient number, since it is larger than the sum of its proper divisors (485848).

647788 is a wasteful number, since it uses less digits than its factorization.

647788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161951 (or 161949 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 647788 is about 804.8527815694. The cubic root of 647788 is about 86.5255362475.

The spelling of 647788 in words is "six hundred forty-seven thousand, seven hundred eighty-eight".