128464641 has 6 divisors (see below), whose sum is σ = 185560050. Its totient is φ = 85643088.

The previous prime is 128464621. The next prime is 128464667. The reversal of 128464641 is 146464821.

It is a happy number.

128464641 is a `hidden beast` number, since 1 + 2 + 8 + 4 + 6 + 4 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64400625 + 64064016 = 8025^2 + 8004^2 .

It is not a de Polignac number, because 128464641 - 2¹⁵ = 128431873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128464596 and 128464605.

It is not an unprimeable number, because it can be changed into a prime (128464601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7136916 + ... + 7136933.

It is an arithmetic number, because the mean of its divisors is an integer number (30926675).

Almost surely, 2^128464641 is an apocalyptic number.

It is an amenable number.

128464641 is a deficient number, since it is larger than the sum of its proper divisors (57095409).

128464641 is a wasteful number, since it uses less digits than its factorization.

128464641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14273855 (or 14273852 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 128464641 is about 11334.2243228198. The cubic root of 128464641 is about 504.5774866796.

The spelling of 128464641 in words is "one hundred twenty-eight million, four hundred sixty-four thousand, six hundred forty-one".