72705806 has 8 divisors (see below), whose sum is σ = 113800464. Its totient is φ = 34772320.

The previous prime is 72705803. The next prime is 72705811. The reversal of 72705806 is 60850727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×72705806² = 10572268452219272, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72705803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790235 + ... + 790326.

It is an arithmetic number, because the mean of its divisors is an integer number (14225058).

Almost surely, 2^72705806 is an apocalyptic number.

72705806 is a deficient number, since it is larger than the sum of its proper divisors (41094658).

72705806 is a wasteful number, since it uses less digits than its factorization.

72705806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580586.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 72705806 is about 8526.7699628875. The cubic root of 72705806 is about 417.3717315453.

The spelling of 72705806 in words is "seventy-two million, seven hundred five thousand, eight hundred six".