72443623 has 6 divisors (see below), whose sum is σ = 82818456. Its totient is φ = 62075232.

The previous prime is 72443611. The next prime is 72443639. The reversal of 72443623 is 32634427.

It is not a de Polignac number, because 72443623 - 2¹³ = 72435431 is a prime.

It is a super-2 number, since 2×72443623² = 10496157026732258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72443663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20911 + ... + 24127.

It is an arithmetic number, because the mean of its divisors is an integer number (13803076).

Almost surely, 2^72443623 is an apocalyptic number.

72443623 is a deficient number, since it is larger than the sum of its proper divisors (10374833).

72443623 is an frugal number, since it uses more digits than its factorization.

72443623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441 (or 3224 counting only the distinct ones).

The product of its digits is 24192, while the sum is 31.

The square root of 72443623 is about 8511.3819676948. The cubic root of 72443623 is about 416.8694352455.

The spelling of 72443623 in words is "seventy-two million, four hundred forty-three thousand, six hundred twenty-three".