73180649 has 2 divisors, whose sum is σ = 73180650. Its totient is φ = 73180648.

The previous prime is 73180619. The next prime is 73180691. The reversal of 73180649 is 94608137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60528400 + 12652249 = 7780^2 + 3557^2 .

It is a cyclic number.

It is not a de Polignac number, because 73180649 - 2¹² = 73176553 is a prime.

It is a super-2 number, since 2×73180649² = 10710814776122402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73180619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36590324 + 36590325.

It is an arithmetic number, because the mean of its divisors is an integer number (36590325).

Almost surely, 2^73180649 is an apocalyptic number.

It is an amenable number.

73180649 is a deficient number, since it is larger than the sum of its proper divisors (1).

73180649 is an equidigital number, since it uses as much as digits as its factorization.

73180649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 73180649 is about 8554.5688962098. The cubic root of 73180649 is about 418.2783815200.

The spelling of 73180649 in words is "seventy-three million, one hundred eighty thousand, six hundred forty-nine".