72070866 has 72 divisors (see below), whose sum is σ = 186171804. Its totient is φ = 20079360.

The previous prime is 72070847. The next prime is 72070879. The reversal of 72070866 is 66807027.

It can be written as a sum of positive squares in 2 ways, for example, as 70207641 + 1863225 = 8379^2 + 1365^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72070866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35166 + ... + 37158.

Almost surely, 2^72070866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72070866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93085902).

72070866 is an abundant number, since it is smaller than the sum of its proper divisors (114100938).

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

72070866 is a wasteful number, since it uses less digits than its factorization.

72070866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2046 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 72070866 is about 8489.4561663277. The cubic root of 72070866 is about 416.1532080222.

The spelling of 72070866 in words is "seventy-two million, seventy thousand, eight hundred sixty-six".