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31911982080 = 2103511672819
BaseRepresentation
bin11101101110000110…
…100011010000000000
310001101000000122201020
4131232012203100000
51010323431411310
622354332305440
72206544241426
oct355606432000
9101330018636
1031911982080
1112596533510
126227312280
133017532744
14178a351116
15c6b902170
hex76e1a3400

31911982080 has 352 divisors, whose sum is σ = 113049423360. Its totient is φ = 7618068480.

The previous prime is 31911982051. The next prime is 31911982093. The reversal of 31911982080 is 8028911913.

It is a tau number, because it is divible by the number of its divisors (352).

It is a super-2 number, since 2×319119820802 (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11318911 + ... + 11321729.

Almost surely, 231911982080 is an apocalyptic number.

31911982080 is a gapful number since it is divisible by the number (30) 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 31911982080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56524711680).

31911982080 is an abundant number, since it is smaller than the sum of its proper divisors (81137441280).

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

31911982080 is a wasteful number, since it uses less digits than its factorization.

31911982080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925 (or 2907 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The spelling of 31911982080 in words is "thirty-one billion, nine hundred eleven million, nine hundred eighty-two thousand, eighty".