72021623 has 2 divisors, whose sum is σ = 72021624. Its totient is φ = 72021622.

The previous prime is 72021601. The next prime is 72021637. The reversal of 72021623 is 32612027.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72021623 is a prime.

It is a super-2 number, since 2×72021623² = 10374228359108258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72021643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36010811 + 36010812.

It is an arithmetic number, because the mean of its divisors is an integer number (36010812).

Almost surely, 2^72021623 is an apocalyptic number.

72021623 is a deficient number, since it is larger than the sum of its proper divisors (1).

72021623 is an equidigital number, since it uses as much as digits as its factorization.

72021623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 72021623 is about 8486.5554260842. Note that the first 3 decimals coincide. The cubic root of 72021623 is about 416.0584064166.

The spelling of 72021623 in words is "seventy-two million, twenty-one thousand, six hundred twenty-three".