647420328 has 48 divisors (see below), whose sum is σ = 1782186900. Its totient is φ = 212267520.

The previous prime is 647420321. The next prime is 647420329. The reversal of 647420328 is 823024746.

647420328 is a `hidden beast` number, since 647 + 4 + 2 + 0 + 3 + 2 + 8 = 666.

647420328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 631114884 + 16305444 = 25122^2 + 4038^2 .

It is a super-2 number, since 2×647420328² = 838306162215255168, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 647420292 and 647420301.

It is not an unprimeable number, because it can be changed into a prime (647420321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69313 + ... + 78096.

Almost surely, 2^647420328 is an apocalyptic number.

It is an amenable number.

647420328 is an abundant number, since it is smaller than the sum of its proper divisors (1134766572).

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

647420328 is a wasteful number, since it uses less digits than its factorization.

647420328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147482 (or 147475 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 647420328 is about 25444.4557418704. The cubic root of 647420328 is about 865.0916307310.

The spelling of 647420328 in words is "six hundred forty-seven million, four hundred twenty thousand, three hundred twenty-eight".