70128240 has 320 divisors, whose sum is σ = 283315200. Its totient is φ = 14017536.

The previous prime is 70128217. The next prime is 70128241. The reversal of 70128240 is 4282107.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 70128240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70128241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3690951 + ... + 3690969.

It is an arithmetic number, because the mean of its divisors is an integer number (885360).

Almost surely, 2^70128240 is an apocalyptic number.

70128240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70128240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141657600).

70128240 is an abundant number, since it is smaller than the sum of its proper divisors (213186960).

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

70128240 is a wasteful number, since it uses less digits than its factorization.

70128240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 70128240 is about 8374.2605643722. The cubic root of 70128240 is about 412.3800496043.

The spelling of 70128240 in words is "seventy million, one hundred twenty-eight thousand, two hundred forty".