128213650 has 24 divisors (see below), whose sum is σ = 243555840. Its totient is φ = 50193360.

The previous prime is 128213641. The next prime is 128213651. The reversal of 128213650 is 56312821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128213651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24930 + ... + 29629.

It is an arithmetic number, because the mean of its divisors is an integer number (10148160).

Almost surely, 2^128213650 is an apocalyptic number.

128213650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128213650 is a deficient number, since it is larger than the sum of its proper divisors (115342190).

128213650 is a wasteful number, since it uses less digits than its factorization.

128213650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54618 (or 54613 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 128213650 is about 11323.1466474651. The cubic root of 128213650 is about 504.2486621490.

It can be divided in two parts, 12821 and 3650, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 128213650 in words is "one hundred twenty-eight million, two hundred thirteen thousand, six hundred fifty".