128905507 has 2 divisors, whose sum is σ = 128905508. Its totient is φ = 128905506.

The previous prime is 128905499. The next prime is 128905559. The reversal of 128905507 is 705509821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128905507 - 2³ = 128905499 is a prime.

It is not a weakly prime, because it can be changed into another prime (128905307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64452753 + 64452754.

It is an arithmetic number, because the mean of its divisors is an integer number (64452754).

Almost surely, 2^128905507 is an apocalyptic number.

128905507 is a deficient number, since it is larger than the sum of its proper divisors (1).

128905507 is an equidigital number, since it uses as much as digits as its factorization.

128905507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 128905507 is about 11353.6561071753. The cubic root of 128905507 is about 505.1540320252.

The spelling of 128905507 in words is "one hundred twenty-eight million, nine hundred five thousand, five hundred seven".