128863461 has 4 divisors (see below), whose sum is σ = 171817952. Its totient is φ = 85908972.

The previous prime is 128863439. The next prime is 128863463. The reversal of 128863461 is 164368821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 164368821 = 3 ⋅54789607.

It is not a de Polignac number, because 128863461 - 2⁷ = 128863333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128863463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21477241 + ... + 21477246.

It is an arithmetic number, because the mean of its divisors is an integer number (42954488).

Almost surely, 2^128863461 is an apocalyptic number.

It is an amenable number.

128863461 is a deficient number, since it is larger than the sum of its proper divisors (42954491).

128863461 is an equidigital number, since it uses as much as digits as its factorization.

128863461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42954490.

The product of its digits is 55296, while the sum is 39.

The square root of 128863461 is about 11351.8043059242. The cubic root of 128863461 is about 505.0991028587.

The spelling of 128863461 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, four hundred sixty-one".