128464905 has 16 divisors (see below), whose sum is σ = 205691904. Its totient is φ = 68465280.

The previous prime is 128464901. The next prime is 128464927. The reversal of 128464905 is 509464821.

128464905 = 2663² + 2664² + ... + 2680².

It is not a de Polignac number, because 128464905 - 2² = 128464901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128464901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29637 + ... + 33693.

It is an arithmetic number, because the mean of its divisors is an integer number (12855744).

Almost surely, 2^128464905 is an apocalyptic number.

128464905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128464905 is a deficient number, since it is larger than the sum of its proper divisors (77226999).

128464905 is a wasteful number, since it uses less digits than its factorization.

128464905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 128464905 is about 11334.2359689571. The cubic root of 128464905 is about 504.5778323217.

The spelling of 128464905 in words is "one hundred twenty-eight million, four hundred sixty-four thousand, nine hundred five".