72801686 has 4 divisors (see below), whose sum is σ = 109202532. Its totient is φ = 36400842.

The previous prime is 72801683. The next prime is 72801689. The reversal of 72801686 is 68610827.

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

It is an interprime number because it is at equal distance from previous prime (72801683) and next prime (72801689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72801683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18200420 + ... + 18200423.

It is an arithmetic number, because the mean of its divisors is an integer number (27300633).

Almost surely, 2^72801686 is an apocalyptic number.

72801686 is a deficient number, since it is larger than the sum of its proper divisors (36400846).

72801686 is a wasteful number, since it uses less digits than its factorization.

72801686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36400845.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 72801686 is about 8532.3904036325. The cubic root of 72801686 is about 417.5551191167. Note that the first 3 decimals are identical.

The spelling of 72801686 in words is "seventy-two million, eight hundred one thousand, six hundred eighty-six".