70820 has 12 divisors (see below), whose sum is σ = 148764. Its totient is φ = 28320.

The previous prime is 70793. The next prime is 70823. The reversal of 70820 is 2807.

It can be written as a sum of positive squares in 2 ways, for example, as 27556 + 43264 = 166^2 + 208^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 70820.

It is not an unprimeable number, because it can be changed into a prime (70823) by changing a digit.

70820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751 + ... + 1790.

It is an arithmetic number, because the mean of its divisors is an integer number (12397).

2⁷⁰⁸²⁰ is an apocalyptic number.

It is an amenable number.

70820 is an abundant number, since it is smaller than the sum of its proper divisors (77944).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74382).

70820 is a wasteful number, since it uses less digits than its factorization.

70820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550 (or 3548 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 70820 is about 266.1202735607. The cubic root of 70820 is about 41.3731550551.

The spelling of 70820 in words is "seventy thousand, eight hundred twenty".