128772015 has 16 divisors (see below), whose sum is σ = 206389248. Its totient is φ = 68560416.

The previous prime is 128772013. The next prime is 128772023. The reversal of 128772015 is 510277821.

It is not a de Polignac number, because 128772015 - 2¹ = 128772013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128772013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2034 + ... + 16176.

It is an arithmetic number, because the mean of its divisors is an integer number (12899328).

Almost surely, 2^128772015 is an apocalyptic number.

128772015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128772015 is a deficient number, since it is larger than the sum of its proper divisors (77617233).

128772015 is a wasteful number, since it uses less digits than its factorization.

128772015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14758.

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 128772015 is about 11347.7757732518. The cubic root of 128772015 is about 504.9795959472.

The spelling of 128772015 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, fifteen".