647190252 has 72 divisors (see below), whose sum is σ = 1670760000. Its totient is φ = 211182048.

The previous prime is 647190241. The next prime is 647190263. The reversal of 647190252 is 252091746.

647190252 is a `hidden beast` number, since 647 + 1 + 9 + 0 + 2 + 5 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (647190241) and next prime (647190263).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 430999 + ... + 432497.

It is an arithmetic number, because the mean of its divisors is an integer number (23205000).

Almost surely, 2^647190252 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 647190252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (835380000).

647190252 is an abundant number, since it is smaller than the sum of its proper divisors (1023569748).

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

647190252 is a wasteful number, since it uses less digits than its factorization.

647190252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755 (or 1750 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 647190252 is about 25439.9341980281. The cubic root of 647190252 is about 864.9891417217.

The spelling of 647190252 in words is "six hundred forty-seven million, one hundred ninety thousand, two hundred fifty-two".