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128775000250 = 25313229227463
BaseRepresentation
bin111011111101110010…
…1101001000010111010
3110022101112212210212201
41313323211221002322
54102212400002000
6135054115100414
712206110304341
oct1677345510272
9408345783781
10128775000250
114a682148746
1220b5a5a170a
13c1b3169300
14633890cb58
15353a53a96a
hex1dfb9690ba

128775000250 has 192 divisors, whose sum is σ = 271813501440. Its totient is φ = 45607161600.

The previous prime is 128775000223. The next prime is 128775000271. The reversal of 128775000250 is 52000577821.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 278131519 + ... + 278131981.

It is an arithmetic number, because the mean of its divisors is an integer number (1415695320).

Almost surely, 2128775000250 is an apocalyptic number.

128775000250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128775000250 is the 191815-th nonagonal number.

128775000250 is an abundant number, since it is smaller than the sum of its proper divisors (143038501190).

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

128775000250 is a wasteful number, since it uses less digits than its factorization.

128775000250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 37.

The spelling of 128775000250 in words is "one hundred twenty-eight billion, seven hundred seventy-five million, two hundred fifty", and thus it is an aban number.