70537220 has 72 divisors (see below), whose sum is σ = 164634120. Its totient is φ = 25359360.

The previous prime is 70537213. The next prime is 70537231. The reversal of 70537220 is 2273507.

It can be written as a sum of positive squares in 12 ways, for example, as 47803396 + 22733824 = 6914^2 + 4768^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 70537220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138326 + ... + 138834.

It is an arithmetic number, because the mean of its divisors is an integer number (2286585).

Almost surely, 2^70537220 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 70537220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82317060).

70537220 is an abundant number, since it is smaller than the sum of its proper divisors (94096900).

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

70537220 is a wasteful number, since it uses less digits than its factorization.

70537220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 26.

The square root of 70537220 is about 8398.6439381605. The cubic root of 70537220 is about 413.1801475936.

The spelling of 70537220 in words is "seventy million, five hundred thirty-seven thousand, two hundred twenty".