70297128 has 72 divisors (see below), whose sum is σ = 209295450. Its totient is φ = 21299520.

The previous prime is 70297127. The next prime is 70297141. The reversal of 70297128 is 82179207.

It can be written as a sum of positive squares in only one way, i.e., 70257924 + 39204 = 8382^2 + 198^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 = 70297092 and 70297101.

It is not an unprimeable number, because it can be changed into a prime (70297121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4678 + ... + 12746.

Almost surely, 2^70297128 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 70297128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104647725).

70297128 is an abundant number, since it is smaller than the sum of its proper divisors (138998322).

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

70297128 is a wasteful number, since it uses less digits than its factorization.

70297128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8103 (or 8085 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 70297128 is about 8384.3382565352. The cubic root of 70297128 is about 412.7108255637.

The spelling of 70297128 in words is "seventy million, two hundred ninety-seven thousand, one hundred twenty-eight".