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664728478 = 2332364239
BaseRepresentation
bin100111100111101…
…111001110011110
31201022210201001021
4213213233032132
52330132302403
6145543234354
722321045621
oct4747571636
91638721037
10664728478
11311249387
121667489ba
13a793cb7b
14643d5db8
153d5568bd
hex279ef39e

664728478 has 4 divisors (see below), whose sum is σ = 997092720. Its totient is φ = 332364238.

The previous prime is 664728469. The next prime is 664728481. The reversal of 664728478 is 874827466.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166182118 + ... + 166182121.

It is an arithmetic number, because the mean of its divisors is an integer number (249273180).

Almost surely, 2664728478 is an apocalyptic number.

664728478 is a deficient number, since it is larger than the sum of its proper divisors (332364242).

664728478 is a wasteful number, since it uses less digits than its factorization.

664728478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332364241.

The product of its digits is 3612672, while the sum is 52.

The square root of 664728478 is about 25782.3287931870. The cubic root of 664728478 is about 872.7330611128.

The spelling of 664728478 in words is "six hundred sixty-four million, seven hundred twenty-eight thousand, four hundred seventy-eight".

Divisors: 1 2 332364239 664728478