647780352 has 96 divisors (see below), whose sum is σ = 1757246400. Its totient is φ = 212148224.

The previous prime is 647780347. The next prime is 647780381. The reversal of 647780352 is 253087746.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361603 + ... + 363389.

It is an arithmetic number, because the mean of its divisors is an integer number (18304650).

Almost surely, 2^647780352 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 647780352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (878623200).

647780352 is an abundant number, since it is smaller than the sum of its proper divisors (1109466048).

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

647780352 is a wasteful number, since it uses less digits than its factorization.

647780352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871 (or 1851 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The square root of 647780352 is about 25451.5294628830. The cubic root of 647780352 is about 865.2519572976.

The spelling of 647780352 in words is "six hundred forty-seven million, seven hundred eighty thousand, three hundred fifty-two".