73542649 has 2 divisors, whose sum is σ = 73542650. Its totient is φ = 73542648.

The previous prime is 73542647. The next prime is 73542671. The reversal of 73542649 is 94624537.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68890000 + 4652649 = 8300^2 + 2157^2 .

It is a cyclic number.

It is not a de Polignac number, because 73542649 - 2¹ = 73542647 is a prime.

Together with 73542647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (73542647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36771324 + 36771325.

It is an arithmetic number, because the mean of its divisors is an integer number (36771325).

Almost surely, 2^73542649 is an apocalyptic number.

It is an amenable number.

73542649 is a deficient number, since it is larger than the sum of its proper divisors (1).

73542649 is an equidigital number, since it uses as much as digits as its factorization.

73542649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 73542649 is about 8575.7010792121. The cubic root of 73542649 is about 418.9669414549.

The spelling of 73542649 in words is "seventy-three million, five hundred forty-two thousand, six hundred forty-nine".