70561872 has 120 divisors (see below), whose sum is σ = 208383240. Its totient is φ = 22256640.

The previous prime is 70561853. The next prime is 70561889. The reversal of 70561872 is 27816507.

It can be written as a sum of positive squares in 4 ways, for example, as 404496 + 70157376 = 636^2 + 8376^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254598 + ... + 254874.

It is an arithmetic number, because the mean of its divisors is an integer number (1736527).

Almost surely, 2^70561872 is an apocalyptic number.

70561872 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70561872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104191620).

70561872 is an abundant number, since it is smaller than the sum of its proper divisors (137821368).

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

70561872 is a wasteful number, since it uses less digits than its factorization.

70561872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 70561872 is about 8400.1114278324. Note that the first 3 decimals coincide. The cubic root of 70561872 is about 413.2282759937.

The spelling of 70561872 in words is "seventy million, five hundred sixty-one thousand, eight hundred seventy-two".