72345671 has 2 divisors, whose sum is σ = 72345672. Its totient is φ = 72345670.

The previous prime is 72345653. The next prime is 72345703. The reversal of 72345671 is 17654327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72345671 - 2¹⁸ = 72083527 is a prime.

It is a super-2 number, since 2×72345671² = 10467792224880482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72345601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36172835 + 36172836.

It is an arithmetic number, because the mean of its divisors is an integer number (36172836).

Almost surely, 2^72345671 is an apocalyptic number.

72345671 is a deficient number, since it is larger than the sum of its proper divisors (1).

72345671 is an equidigital number, since it uses as much as digits as its factorization.

72345671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 35.

The square root of 72345671 is about 8505.6258441105. The cubic root of 72345671 is about 416.6814655722.

Adding to 72345671 its reverse (17654327), we get a palindrome (89999998).

The spelling of 72345671 in words is "seventy-two million, three hundred forty-five thousand, six hundred seventy-one".