72831361 has 4 divisors (see below), whose sum is σ = 73152432. Its totient is φ = 72510292.

The previous prime is 72831347. The next prime is 72831371. The reversal of 72831361 is 16313827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72831361 - 2⁷ = 72831233 is a prime.

It is a super-2 number, since 2×72831361² = 10608814290224642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72831301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160195 + ... + 160648.

It is an arithmetic number, because the mean of its divisors is an integer number (18288108).

Almost surely, 2^72831361 is an apocalyptic number.

It is an amenable number.

72831361 is a deficient number, since it is larger than the sum of its proper divisors (321071).

72831361 is a wasteful number, since it uses less digits than its factorization.

72831361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321070.

The product of its digits is 6048, while the sum is 31.

The square root of 72831361 is about 8534.1291881480. The cubic root of 72831361 is about 417.6118452066.

The spelling of 72831361 in words is "seventy-two million, eight hundred thirty-one thousand, three hundred sixty-one".