70689280 has 80 divisors (see below), whose sum is σ = 173017944. Its totient is φ = 27688960.

The previous prime is 70689271. The next prime is 70689317. The reversal of 70689280 is 8298607.

It can be written as a sum of positive squares in 4 ways, for example, as 56791296 + 13897984 = 7536^2 + 3728^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135420 + ... + 135940.

Almost surely, 2^70689280 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 70689280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86508972).

70689280 is an abundant number, since it is smaller than the sum of its proper divisors (102328664).

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

70689280 is an equidigital number, since it uses as much as digits as its factorization.

70689280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 70689280 is about 8407.6917165177. The cubic root of 70689280 is about 413.4768376727.

The spelling of 70689280 in words is "seventy million, six hundred eighty-nine thousand, two hundred eighty".