70128817 has 24 divisors (see below), whose sum is σ = 81510912. Its totient is φ = 60170880.

The previous prime is 70128809. The next prime is 70128823. The reversal of 70128817 is 71882107.

It is not a de Polignac number, because 70128817 - 2³ = 70128809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70128847) 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 23 ways as a sum of consecutive naturals, for example, 314368 + ... + 314590.

It is an arithmetic number, because the mean of its divisors is an integer number (3396288).

Almost surely, 2^70128817 is an apocalyptic number.

It is an amenable number.

70128817 is a deficient number, since it is larger than the sum of its proper divisors (11382095).

70128817 is a wasteful number, since it uses less digits than its factorization.

70128817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 70128817 is about 8374.2950151043. The cubic root of 70128817 is about 412.3811805925.

The spelling of 70128817 in words is "seventy million, one hundred twenty-eight thousand, eight hundred seventeen".