128487945 has 16 divisors (see below), whose sum is σ = 206439552. Its totient is φ = 68240640.

The previous prime is 128487941. The next prime is 128487949. The reversal of 128487945 is 549784821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128487941) and next prime (128487949).

It is not a de Polignac number, because 128487945 - 2² = 128487941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128487894 and 128487903.

It is not an unprimeable number, because it can be changed into a prime (128487941) 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, 14157 + ... + 21386.

It is an arithmetic number, because the mean of its divisors is an integer number (12902472).

Almost surely, 2^128487945 is an apocalyptic number.

128487945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128487945 is a deficient number, since it is larger than the sum of its proper divisors (77951607).

128487945 is a wasteful number, since it uses less digits than its factorization.

128487945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35792.

The product of its digits is 645120, while the sum is 48.

The square root of 128487945 is about 11335.2523130277. The cubic root of 128487945 is about 504.6079956267.

The spelling of 128487945 in words is "one hundred twenty-eight million, four hundred eighty-seven thousand, nine hundred forty-five".