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11947047840 = 253257131731173
BaseRepresentation
bin10110010000001100…
…10111101110100000
31010211121110220122100
423020012113232200
5143431421012330
65253254410400
7602026142160
oct131006275640
933747426570
1011947047840
115080884962
122395060a00
1311851b47a0
148149965a0
1549dcb1060
hex2c8197ba0

11947047840 has 1152 divisors, whose sum is σ = 55160082432. Its totient is φ = 2282618880.

The previous prime is 11947047793. The next prime is 11947047859. The reversal of 11947047840 is 4874074911.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 69057994 + ... + 69058166.

It is an arithmetic number, because the mean of its divisors is an integer number (47882016).

Almost surely, 211947047840 is an apocalyptic number.

11947047840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11947047840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27580041216).

11947047840 is an abundant number, since it is smaller than the sum of its proper divisors (43213034592).

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

11947047840 is a wasteful number, since it uses less digits than its factorization.

11947047840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 11947047840 in words is "eleven billion, nine hundred forty-seven million, forty-seven thousand, eight hundred forty".