128478745 has 8 divisors (see below), whose sum is σ = 154263816. Its totient is φ = 102723456.

The previous prime is 128478739. The next prime is 128478751. The reversal of 128478745 is 547874821.

It is an interprime number because it is at equal distance from previous prime (128478739) and next prime (128478751).

It can be written as a sum of positive squares in 4 ways, for example, as 28858384 + 99620361 = 5372^2 + 9981^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128478745 - 2¹¹ = 128476697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128478695 and 128478704.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3519 + ... + 16411.

It is an arithmetic number, because the mean of its divisors is an integer number (19282977).

Almost surely, 2^128478745 is an apocalyptic number.

It is an amenable number.

128478745 is a deficient number, since it is larger than the sum of its proper divisors (25785071).

128478745 is a wasteful number, since it uses less digits than its factorization.

128478745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14891.

The product of its digits is 501760, while the sum is 46.

The square root of 128478745 is about 11334.8464921233. The cubic root of 128478745 is about 504.5959516839.

The spelling of 128478745 in words is "one hundred twenty-eight million, four hundred seventy-eight thousand, seven hundred forty-five".