72453643 has 4 divisors (see below), whose sum is σ = 76715640. Its totient is φ = 68191648.

The previous prime is 72453617. The next prime is 72453653. The reversal of 72453643 is 34635427.

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 72453643 - 2⁹ = 72453131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72453599 and 72453608.

It is not an unprimeable number, because it can be changed into a prime (72453653) 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, 2130973 + ... + 2131006.

It is an arithmetic number, because the mean of its divisors is an integer number (19178910).

Almost surely, 2^72453643 is an apocalyptic number.

72453643 is a deficient number, since it is larger than the sum of its proper divisors (4261997).

72453643 is a wasteful number, since it uses less digits than its factorization.

72453643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261996.

The product of its digits is 60480, while the sum is 34.

The square root of 72453643 is about 8511.9705709078. The cubic root of 72453643 is about 416.8886540486. Note that the first 3 decimals are identical.

The spelling of 72453643 in words is "seventy-two million, four hundred fifty-three thousand, six hundred forty-three".