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1312720764 = 223109393397
BaseRepresentation
bin100111000111110…
…1000011101111100
310101111010010100120
41032033220131330
510142024031024
6334132054540
744346641145
oct11617503574
93344103316
101312720764
11613aa65a3
12307764450
1317bc70064
14c64b2acc
157a3a4479
hex4e3e877c

1312720764 has 12 divisors (see below), whose sum is σ = 3063015144. Its totient is φ = 437573584.

The previous prime is 1312720753. The next prime is 1312720771. The reversal of 1312720764 is 4670272131.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54696687 + ... + 54696710.

It is an arithmetic number, because the mean of its divisors is an integer number (255251262).

Almost surely, 21312720764 is an apocalyptic number.

It is an amenable number.

1312720764 is an abundant number, since it is smaller than the sum of its proper divisors (1750294380).

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

1312720764 is a wasteful number, since it uses less digits than its factorization.

1312720764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109393404 (or 109393402 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 1312720764 is about 36231.4885700270. The cubic root of 1312720764 is about 1094.9411682076.

Adding to 1312720764 its reverse (4670272131), we get a palindrome (5982992895).

The spelling of 1312720764 in words is "one billion, three hundred twelve million, seven hundred twenty thousand, seven hundred sixty-four".

Divisors: 1 2 3 4 6 12 109393397 218786794 328180191 437573588 656360382 1312720764