647772 has 24 divisors (see below), whose sum is σ = 1577856. Its totient is φ = 206448.

The previous prime is 647771. The next prime is 647783. The reversal of 647772 is 277746.

It is a happy number.

647772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 898 + ... + 1449.

It is an arithmetic number, because the mean of its divisors is an integer number (65744).

2⁶⁴⁷⁷⁷² is an apocalyptic number.

It is an amenable number.

647772 is an abundant number, since it is smaller than the sum of its proper divisors (930084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647772 is a wasteful number, since it uses less digits than its factorization.

647772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377 (or 2375 counting only the distinct ones).

The product of its digits is 16464, while the sum is 33.

The square root of 647772 is about 804.8428418021. The cubic root of 647772 is about 86.5248238642.

The spelling of 647772 in words is "six hundred forty-seven thousand, seven hundred seventy-two".