70129388 has 72 divisors (see below), whose sum is σ = 149787792. Its totient is φ = 28619136.

The previous prime is 70129387. The next prime is 70129417. The reversal of 70129388 is 88392107.

It is a super-2 number, since 2×70129388² = 9836262122509088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (70129387) 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 23 ways as a sum of consecutive naturals, for example, 446606 + ... + 446762.

It is an arithmetic number, because the mean of its divisors is an integer number (2080386).

Almost surely, 2^70129388 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 70129388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74893896).

70129388 is an abundant number, since it is smaller than the sum of its proper divisors (79658404).

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

70129388 is a wasteful number, since it uses less digits than its factorization.

70129388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 70129388 is about 8374.3291074569. The cubic root of 70129388 is about 412.3822998139.

The spelling of 70129388 in words is "seventy million, one hundred twenty-nine thousand, three hundred eighty-eight".