72871813 has 8 divisors (see below), whose sum is σ = 84525632. Its totient is φ = 61528896.

The previous prime is 72871811. The next prime is 72871819. The reversal of 72871813 is 31817827.

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

It is a cyclic number.

It is not a de Polignac number, because 72871813 - 2¹ = 72871811 is a prime.

It is a super-2 number, since 2×72871813² = 10620602259813938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72871811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77220 + ... + 78157.

It is an arithmetic number, because the mean of its divisors is an integer number (10565704).

Almost surely, 2^72871813 is an apocalyptic number.

It is an amenable number.

72871813 is a deficient number, since it is larger than the sum of its proper divisors (11653819).

72871813 is a wasteful number, since it uses less digits than its factorization.

72871813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155451.

The product of its digits is 18816, while the sum is 37.

The square root of 72871813 is about 8536.4988724887. The cubic root of 72871813 is about 417.6891475641.

The spelling of 72871813 in words is "seventy-two million, eight hundred seventy-one thousand, eight hundred thirteen".