128123620 has 24 divisors (see below), whose sum is σ = 277740288. Its totient is φ = 49596000.

The previous prime is 128123609. The next prime is 128123621. The reversal of 128123620 is 26321821.

It is not an unprimeable number, because it can be changed into a prime (128123621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102706 + ... + 103945.

It is an arithmetic number, because the mean of its divisors is an integer number (11572512).

Almost surely, 2^128123620 is an apocalyptic number.

128123620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128123620 is an abundant number, since it is smaller than the sum of its proper divisors (149616668).

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

128123620 is a wasteful number, since it uses less digits than its factorization.

128123620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206691 (or 206689 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 128123620 is about 11319.1704643052. The cubic root of 128123620 is about 504.1306088397.

The spelling of 128123620 in words is "one hundred twenty-eight million, one hundred twenty-three thousand, six hundred twenty".