128737856 has 28 divisors (see below), whose sum is σ = 275117052. Its totient is φ = 59417088.

The previous prime is 128737813. The next prime is 128737867. The reversal of 128737856 is 658737821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 35808256 + 92929600 = 5984^2 + 9640^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128737856.

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 3 ways as a sum of consecutive naturals, for example, 76535 + ... + 78198.

It is an arithmetic number, because the mean of its divisors is an integer number (9825609).

Almost surely, 2^128737856 is an apocalyptic number.

128737856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128737856 is an abundant number, since it is smaller than the sum of its proper divisors (146379196).

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

128737856 is a wasteful number, since it uses less digits than its factorization.

128737856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154758 (or 154748 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The square root of 128737856 is about 11346.2705767137. The cubic root of 128737856 is about 504.9349404799.

The spelling of 128737856 in words is "one hundred twenty-eight million, seven hundred thirty-seven thousand, eight hundred fifty-six".