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128484930 = 2357611833
BaseRepresentation
bin1111010100010…
…00011001000010
322221202201012010
413222020121002
5230343004210
620425513350
73120050430
oct752103102
9287681163
10128484930
11665876a2
1237042856
1320807cb2
14130c7d50
15b42e920
hex7a88642

128484930 has 32 divisors (see below), whose sum is σ = 352416384. Its totient is φ = 29367936.

The previous prime is 128484899. The next prime is 128484953. The reversal of 128484930 is 39484821.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305707 + ... + 306126.

It is an arithmetic number, because the mean of its divisors is an integer number (11013012).

Almost surely, 2128484930 is an apocalyptic number.

128484930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128484930 is an abundant number, since it is smaller than the sum of its proper divisors (223931454).

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

128484930 is a wasteful number, since it uses less digits than its factorization.

128484930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611850.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 128484930 is about 11335.1193200601. The cubic root of 128484930 is about 504.6040486805.

The spelling of 128484930 in words is "one hundred twenty-eight million, four hundred eighty-four thousand, nine hundred thirty".