647504 has 40 divisors (see below), whose sum is σ = 1479072. Its totient is φ = 270720.

The previous prime is 647503. The next prime is 647509. The reversal of 647504 is 405746.

It is a super-2 number, since 2×647504² = 838522860032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647504.

It is not an unprimeable number, because it can be changed into a prime (647503) 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, 2147 + ... + 2429.

2⁶⁴⁷⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (739536).

647504 is an abundant number, since it is smaller than the sum of its proper divisors (831568).

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

647504 is a wasteful number, since it uses less digits than its factorization.

647504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 647504 is about 804.6763324468. The cubic root of 647504 is about 86.5128897004.

The spelling of 647504 in words is "six hundred forty-seven thousand, five hundred four".