128533640 has 32 divisors (see below), whose sum is σ = 289586880. Its totient is φ = 51344832.

The previous prime is 128533621. The next prime is 128533679. The reversal of 128533640 is 46335821.

It is a super-2 number, since 2×128533640² = 33041793223299200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128533597 and 128533606.

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 7 ways as a sum of consecutive naturals, for example, 37019 + ... + 40341.

It is an arithmetic number, because the mean of its divisors is an integer number (9049590).

Almost surely, 2^128533640 is an apocalyptic number.

128533640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128533640 is an abundant number, since it is smaller than the sum of its proper divisors (161053240).

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

128533640 is a wasteful number, since it uses less digits than its factorization.

128533640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301 (or 4297 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 128533640 is about 11337.2677484480. The cubic root of 128533640 is about 504.6678075400.

The spelling of 128533640 in words is "one hundred twenty-eight million, five hundred thirty-three thousand, six hundred forty".