647550 has 36 divisors (see below), whose sum is σ = 1740960. Its totient is φ = 172560.

The previous prime is 647531. The next prime is 647551. The reversal of 647550 is 55746.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

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 647550.

It is not an unprimeable number, because it can be changed into a prime (647551) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 270 + ... + 1169.

It is an arithmetic number, because the mean of its divisors is an integer number (48360).

2⁶⁴⁷⁵⁵⁰ is an apocalyptic number.

647550 is an abundant number, since it is smaller than the sum of its proper divisors (1093410).

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

647550 is a wasteful number, since it uses less digits than its factorization.

647550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 647550 is about 804.7049148601. The cubic root of 647550 is about 86.5149383358.

The spelling of 647550 in words is "six hundred forty-seven thousand, five hundred fifty".