72440623 has 4 divisors (see below), whose sum is σ = 72885208. Its totient is φ = 71996040.

The previous prime is 72440617. The next prime is 72440629. The reversal of 72440623 is 32604427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32604427 = 5501 ⋅5927.

It is an interprime number because it is at equal distance from previous prime (72440617) and next prime (72440629).

It is a cyclic number.

It is not a de Polignac number, because 72440623 - 2⁵ = 72440591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72440591 and 72440600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72440629) 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, 222048 + ... + 222373.

It is an arithmetic number, because the mean of its divisors is an integer number (18221302).

Almost surely, 2^72440623 is an apocalyptic number.

72440623 is a deficient number, since it is larger than the sum of its proper divisors (444585).

72440623 is a wasteful number, since it uses less digits than its factorization.

72440623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444584.

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

The square root of 72440623 is about 8511.2057312698. The cubic root of 72440623 is about 416.8636807682.

The spelling of 72440623 in words is "seventy-two million, four hundred forty thousand, six hundred twenty-three".