72008491 has 2 divisors, whose sum is σ = 72008492. Its totient is φ = 72008490.

The previous prime is 72008477. The next prime is 72008507. The reversal of 72008491 is 19480027.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72008491 is a prime.

It is not a weakly prime, because it can be changed into another prime (72008411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36004245 + 36004246.

It is an arithmetic number, because the mean of its divisors is an integer number (36004246).

Almost surely, 2^72008491 is an apocalyptic number.

72008491 is a deficient number, since it is larger than the sum of its proper divisors (1).

72008491 is an equidigital number, since it uses as much as digits as its factorization.

72008491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 72008491 is about 8485.7816964614. The cubic root of 72008491 is about 416.0331176636.

The spelling of 72008491 in words is "seventy-two million, eight thousand, four hundred ninety-one".