72443431 has 8 divisors (see below), whose sum is σ = 73100160. Its totient is φ = 71789688.

The previous prime is 72443429. The next prime is 72443461. The reversal of 72443431 is 13434427.

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 72443431 - 2¹ = 72443429 is a prime.

It is a super-2 number, since 2×72443431² = 10496101390103522, 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 72443431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72443461) 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, 97660 + ... + 98398.

It is an arithmetic number, because the mean of its divisors is an integer number (9137520).

Almost surely, 2^72443431 is an apocalyptic number.

72443431 is a deficient number, since it is larger than the sum of its proper divisors (656729).

72443431 is a wasteful number, since it uses less digits than its factorization.

72443431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493.

The product of its digits is 8064, while the sum is 28.

The square root of 72443431 is about 8511.3706886729. The cubic root of 72443431 is about 416.8690669637.

Adding to 72443431 its reverse (13434427), we get a palindrome (85877858).

The spelling of 72443431 in words is "seventy-two million, four hundred forty-three thousand, four hundred thirty-one".