72042621 has 16 divisors (see below), whose sum is σ = 111419904. Its totient is φ = 40551984.

The previous prime is 72042613. The next prime is 72042637. The reversal of 72042621 is 12624027.

It is not a de Polignac number, because 72042621 - 2³ = 72042613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72042591 and 72042600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72042121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24195 + ... + 27008.

It is an arithmetic number, because the mean of its divisors is an integer number (6963744).

Almost surely, 2^72042621 is an apocalyptic number.

It is an amenable number.

72042621 is a deficient number, since it is larger than the sum of its proper divisors (39377283).

72042621 is a wasteful number, since it uses less digits than its factorization.

72042621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51280.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 72042621 is about 8487.7924691877. The cubic root of 72042621 is about 416.0988366150.

Adding to 72042621 its reverse (12624027), we get a palindrome (84666648).

The spelling of 72042621 in words is "seventy-two million, forty-two thousand, six hundred twenty-one".