72438031 has 4 divisors (see below), whose sum is σ = 72601992. Its totient is φ = 72274072.

The previous prime is 72438019. The next prime is 72438053. The reversal of 72438031 is 13083427.

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 72438031 - 2⁵ = 72437999 is a prime.

It is a super-2 number, since 2×72438031² = 10494536670313922, 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 (72438011) 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, 81316 + ... + 82201.

It is an arithmetic number, because the mean of its divisors is an integer number (18150498).

Almost surely, 2^72438031 is an apocalyptic number.

72438031 is a deficient number, since it is larger than the sum of its proper divisors (163961).

72438031 is a wasteful number, since it uses less digits than its factorization.

72438031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163960.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 72438031 is about 8511.0534600600. The cubic root of 72438031 is about 416.8587087718.

The spelling of 72438031 in words is "seventy-two million, four hundred thirty-eight thousand, thirty-one".