647633 has 6 divisors (see below), whose sum is σ = 753426. Its totient is φ = 555072.

The previous prime is 647627. The next prime is 647641. The reversal of 647633 is 336746.

647633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 117649 = 728^2 + 343^2 .

It is not a de Polignac number, because 647633 - 2⁴ = 647617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647596 and 647605.

It is not an unprimeable number, because it can be changed into a prime (647663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6560 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (125571).

2⁶⁴⁷⁶³³ is an apocalyptic number.

It is an amenable number.

647633 is a deficient number, since it is larger than the sum of its proper divisors (105793).

647633 is a wasteful number, since it uses less digits than its factorization.

647633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13231 (or 13224 counting only the distinct ones).

The product of its digits is 9072, while the sum is 29.

The square root of 647633 is about 804.7564849071. The cubic root of 647633 is about 86.5186345410.

The spelling of 647633 in words is "six hundred forty-seven thousand, six hundred thirty-three".