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645738748 = 22768721001
BaseRepresentation
bin100110011111010…
…011000011111100
31200000001221000221
4212133103003330
52310302114443
6144024231124
722000455154
oct4637230374
91600057027
10645738748
11301559096
1216030b4a4
13a3a21545
1461a91764
153ba54eed
hex267d30fc

645738748 has 12 divisors (see below), whose sum is σ = 1130243632. Its totient is φ = 322812000.

The previous prime is 645738707. The next prime is 645738749. The reversal of 645738748 is 847837546.

It is a junction number, because it is equal to n+sod(n) for n = 645738695 and 645738704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645738749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20248 + ... + 41248.

Almost surely, 2645738748 is an apocalyptic number.

It is an amenable number.

645738748 is a deficient number, since it is larger than the sum of its proper divisors (484504884).

645738748 is a wasteful number, since it uses less digits than its factorization.

645738748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28692 (or 28690 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 52.

The square root of 645738748 is about 25411.3901233286. The cubic root of 645738748 is about 864.3419981677.

The spelling of 645738748 in words is "six hundred forty-five million, seven hundred thirty-eight thousand, seven hundred forty-eight".