647538 has 8 divisors (see below), whose sum is σ = 1295088. Its totient is φ = 215844.

The previous prime is 647531. The next prime is 647551. The reversal of 647538 is 835746.

647538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

647538 is an admirable number.

It is a super-2 number, since 2×647538² = 838610922888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 647499 and 647508.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647538.

It is not an unprimeable number, because it can be changed into a prime (647531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53956 + ... + 53967.

It is an arithmetic number, because the mean of its divisors is an integer number (161886).

2⁶⁴⁷⁵³⁸ is an apocalyptic number.

647538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

647538 is a wasteful number, since it uses less digits than its factorization.

647538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107928.

The product of its digits is 20160, while the sum is 33.

The square root of 647538 is about 804.6974586762. The cubic root of 647538 is about 86.5144039185.

The spelling of 647538 in words is "six hundred forty-seven thousand, five hundred thirty-eight".