72812031 has 4 divisors (see below), whose sum is σ = 97082712. Its totient is φ = 48541352.

The previous prime is 72811993. The next prime is 72812063. The reversal of 72812031 is 13021827.

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

It is a cyclic number.

It is not a de Polignac number, because 72812031 - 2⁷ = 72811903 is a prime.

It is a super-2 number, since 2×72812031² = 10603183716689922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72811992 and 72812010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72813031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12135336 + ... + 12135341.

It is an arithmetic number, because the mean of its divisors is an integer number (24270678).

Almost surely, 2^72812031 is an apocalyptic number.

72812031 is a deficient number, since it is larger than the sum of its proper divisors (24270681).

72812031 is a wasteful number, since it uses less digits than its factorization.

72812031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24270680.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 72812031 is about 8532.9966014291. The cubic root of 72812031 is about 417.5748961455.

Adding to 72812031 its reverse (13021827), we get a palindrome (85833858).

The spelling of 72812031 in words is "seventy-two million, eight hundred twelve thousand, thirty-one".