128506215 has 16 divisors (see below), whose sum is σ = 216432000. Its totient is φ = 64929312.

The previous prime is 128506211. The next prime is 128506223. The reversal of 128506215 is 512605821.

It is not a de Polignac number, because 128506215 - 2² = 128506211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128506211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225165 + ... + 225734.

It is an arithmetic number, because the mean of its divisors is an integer number (13527000).

Almost surely, 2^128506215 is an apocalyptic number.

128506215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128506215 is a deficient number, since it is larger than the sum of its proper divisors (87925785).

128506215 is a wasteful number, since it uses less digits than its factorization.

128506215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450926.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 128506215 is about 11336.0581773384. The cubic root of 128506215 is about 504.6319116217.

The spelling of 128506215 in words is "one hundred twenty-eight million, five hundred six thousand, two hundred fifteen".