70128547 has 4 divisors (see below), whose sum is σ = 70263160. Its totient is φ = 69993936.

The previous prime is 70128523. The next prime is 70128551. The reversal of 70128547 is 74582107.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74582107 = 367 ⋅203221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70128547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70128347) 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, 66522 + ... + 67567.

It is an arithmetic number, because the mean of its divisors is an integer number (17565790).

Almost surely, 2^70128547 is an apocalyptic number.

70128547 is a deficient number, since it is larger than the sum of its proper divisors (134613).

70128547 is a wasteful number, since it uses less digits than its factorization.

70128547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134612.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 70128547 is about 8374.2788943288. The cubic root of 70128547 is about 412.3806513614.

The spelling of 70128547 in words is "seventy million, one hundred twenty-eight thousand, five hundred forty-seven".