70128040 has 64 divisors (see below), whose sum is σ = 164520720. Its totient is φ = 26880000.

The previous prime is 70128017. The next prime is 70128041. The reversal of 70128040 is 4082107.

It can be written as a sum of positive squares in 8 ways, for example, as 7496644 + 62631396 = 2738^2 + 7914^2 .

It is not an unprimeable number, because it can be changed into a prime (70128041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99690 + ... + 100390.

Almost surely, 2^70128040 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 70128040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82260360).

70128040 is an abundant number, since it is smaller than the sum of its proper divisors (94392680).

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

70128040 is a wasteful number, since it uses less digits than its factorization.

70128040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 70128040 is about 8374.2486230109. The cubic root of 70128040 is about 412.3796575792.

The spelling of 70128040 in words is "seventy million, one hundred twenty-eight thousand, forty".