70012820 has 18 divisors (see below), whose sum is σ = 147105546. Its totient is φ = 27990160.

The previous prime is 70012801. The next prime is 70012837. The reversal of 70012820 is 2821007.

It can be written as a sum of positive squares in only one way, i.e., 56010256 + 14002564 = 7484^2 + 3742^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 70012792 and 70012801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36485 + ... + 38355.

Almost surely, 2^70012820 is an apocalyptic number.

It is an amenable number.

70012820 is an abundant number, since it is smaller than the sum of its proper divisors (77092726).

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

70012820 is an equidigital number, since it uses as much as digits as its factorization.

70012820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 70012820 is about 8367.3663718042. The cubic root of 70012820 is about 412.1536879106.

Multiplying 70012820 by its sum of digits (20), we get a square (1400256400 = 37420²).

70012820 divided by its sum of digits (20) gives a square (3500641 = 1871²).

Adding to 70012820 its reverse (2821007), we get a palindrome (72833827).

The spelling of 70012820 in words is "seventy million, twelve thousand, eight hundred twenty".