128640214 has 8 divisors (see below), whose sum is σ = 195678288. Its totient is φ = 63414120.

The previous prime is 128640199. The next prime is 128640221. The reversal of 128640214 is 412046821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452817 + ... + 453100.

It is an arithmetic number, because the mean of its divisors is an integer number (24459786).

Almost surely, 2^128640214 is an apocalyptic number.

128640214 is a deficient number, since it is larger than the sum of its proper divisors (67038074).

128640214 is an equidigital number, since it uses as much as digits as its factorization.

128640214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905990.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 128640214 is about 11341.9669369999. The cubic root of 128640214 is about 504.8072512129.

The spelling of 128640214 in words is "one hundred twenty-eight million, six hundred forty thousand, two hundred fourteen".