72162431 has 8 divisors (see below), whose sum is σ = 82145664. Its totient is φ = 62749720.

The previous prime is 72162427. The next prime is 72162439. The reversal of 72162431 is 13426127.

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

It is not a de Polignac number, because 72162431 - 2² = 72162427 is a prime.

It is a super-2 number, since 2×72162431² = 10414832895659522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72162431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72162439) 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, 142361 + ... + 142866.

It is an arithmetic number, because the mean of its divisors is an integer number (10268208).

Almost surely, 2^72162431 is an apocalyptic number.

72162431 is a deficient number, since it is larger than the sum of its proper divisors (9983233).

72162431 is a wasteful number, since it uses less digits than its factorization.

72162431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285261.

The product of its digits is 2016, while the sum is 26.

The square root of 72162431 is about 8494.8473205820. The cubic root of 72162431 is about 416.3293723295.

Adding to 72162431 its reverse (13426127), we get a palindrome (85588558).

The spelling of 72162431 in words is "seventy-two million, one hundred sixty-two thousand, four hundred thirty-one".