70639128 has 192 divisors, whose sum is σ = 235872000. Its totient is φ = 19377792.

The previous prime is 70639109. The next prime is 70639133. The reversal of 70639128 is 82193607.

70639128 is a `hidden beast` number, since 7 + 0 + 639 + 12 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 70639092 and 70639101.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 394543 + ... + 394721.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^70639128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70639128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117936000).

70639128 is an abundant number, since it is smaller than the sum of its proper divisors (165232872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70639128 is a wasteful number, since it uses less digits than its factorization.

70639128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 70639128 is about 8404.7086802578. The cubic root of 70639128 is about 413.3790312523.

The spelling of 70639128 in words is "seventy million, six hundred thirty-nine thousand, one hundred twenty-eight".