72071885 has 4 divisors (see below), whose sum is σ = 86486268. Its totient is φ = 57657504.

The previous prime is 72071849. The next prime is 72071897. The reversal of 72071885 is 58817027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56595529 + 15476356 = 7523^2 + 3934^2 .

It is a cyclic number.

It is not a de Polignac number, because 72071885 - 2¹⁶ = 72006349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7207184 + ... + 7207193.

It is an arithmetic number, because the mean of its divisors is an integer number (21621567).

Almost surely, 2^72071885 is an apocalyptic number.

It is an amenable number.

72071885 is a deficient number, since it is larger than the sum of its proper divisors (14414383).

72071885 is a wasteful number, since it uses less digits than its factorization.

72071885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14414382.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 72071885 is about 8489.5161817385. The cubic root of 72071885 is about 416.1551693238.

The spelling of 72071885 in words is "seventy-two million, seventy-one thousand, eight hundred eighty-five".