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79257968640 = 2133557963
BaseRepresentation
bin100100111010000100…
…1001010000000000000
321120120121211222100000
41021310021022000000
52244310014444030
6100224405200000
75504041421604
oct1116411120000
9246517758300
1079257968640
1130682069a24
121343b400000
13762149a3c6
143b9c3bd504
1520dd297860
hex127424a000

79257968640 has 336 divisors, whose sum is σ = 284955679008. Its totient is φ = 21132804096.

The previous prime is 79257968617. The next prime is 79257968683. The reversal of 79257968640 is 4686975297.

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, 9949299 + ... + 9957261.

It is an arithmetic number, because the mean of its divisors is an integer number (848082378).

Almost surely, 279257968640 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 79257968640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142477839504).

79257968640 is an abundant number, since it is smaller than the sum of its proper divisors (205697710368).

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

79257968640 is an frugal number, since it uses more digits than its factorization.

79257968640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8009 (or 7973 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 79257968640 in words is "seventy-nine billion, two hundred fifty-seven million, nine hundred sixty-eight thousand, six hundred forty".