72072638 has 8 divisors (see below), whose sum is σ = 117937080. Its totient is φ = 32760280.

The previous prime is 72072631. The next prime is 72072683. The reversal of 72072638 is 83627027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 72072598 and 72072607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72072631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637993 + ... + 1638036.

It is an arithmetic number, because the mean of its divisors is an integer number (14742135).

Almost surely, 2^72072638 is an apocalyptic number.

72072638 is a deficient number, since it is larger than the sum of its proper divisors (45864442).

72072638 is a wasteful number, since it uses less digits than its factorization.

72072638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276042.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 72072638 is about 8489.5605304397. The cubic root of 72072638 is about 416.1566186350.

The spelling of 72072638 in words is "seventy-two million, seventy-two thousand, six hundred thirty-eight".