70128861 has 16 divisors (see below), whose sum is σ = 102254400. Its totient is φ = 42398720.

The previous prime is 70128857. The next prime is 70128871. The reversal of 70128861 is 16882107.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 70128861 - 2² = 70128857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70128871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12451 + ... + 17183.

It is an arithmetic number, because the mean of its divisors is an integer number (6390900).

Almost surely, 2^70128861 is an apocalyptic number.

It is an amenable number.

70128861 is a deficient number, since it is larger than the sum of its proper divisors (32125539).

70128861 is a wasteful number, since it uses less digits than its factorization.

70128861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 70128861 is about 8374.2976421907. The cubic root of 70128861 is about 412.3812668375.

The spelling of 70128861 in words is "seventy million, one hundred twenty-eight thousand, eight hundred sixty-one".