72506503 has 2 divisors, whose sum is σ = 72506504. Its totient is φ = 72506502.

The previous prime is 72506501. The next prime is 72506507. The reversal of 72506503 is 30560527.

It is a weak prime.

It is an emirp because it is prime and its reverse (30560527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72506503 - 2¹ = 72506501 is a prime.

Together with 72506501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72506501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36253251 + 36253252.

It is an arithmetic number, because the mean of its divisors is an integer number (36253252).

Almost surely, 2^72506503 is an apocalyptic number.

72506503 is a deficient number, since it is larger than the sum of its proper divisors (1).

72506503 is an equidigital number, since it uses as much as digits as its factorization.

72506503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 72506503 is about 8515.0750437092. The cubic root of 72506503 is about 416.9900125467.

The spelling of 72506503 in words is "seventy-two million, five hundred six thousand, five hundred three".