73687321 has 2 divisors, whose sum is σ = 73687322. Its totient is φ = 73687320.

The previous prime is 73687307. The next prime is 73687343. The reversal of 73687321 is 12378637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37687321 + 36000000 = 6139^2 + 6000^2 .

It is a cyclic number.

It is not a de Polignac number, because 73687321 - 2¹³ = 73679129 is a prime.

It is not a weakly prime, because it can be changed into another prime (73687381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36843660 + 36843661.

It is an arithmetic number, because the mean of its divisors is an integer number (36843661).

Almost surely, 2^73687321 is an apocalyptic number.

It is an amenable number.

73687321 is a deficient number, since it is larger than the sum of its proper divisors (1).

73687321 is an equidigital number, since it uses as much as digits as its factorization.

73687321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 73687321 is about 8584.1319304866. The cubic root of 73687321 is about 419.2414900062.

The spelling of 73687321 in words is "seventy-three million, six hundred eighty-seven thousand, three hundred twenty-one".