73870009 has 2 divisors, whose sum is σ = 73870010. Its totient is φ = 73870008.

The previous prime is 73870007. The next prime is 73870031. The reversal of 73870009 is 90007837.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53978409 + 19891600 = 7347^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 73870009 - 2¹ = 73870007 is a prime.

Together with 73870007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (73870007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36935004 + 36935005.

It is an arithmetic number, because the mean of its divisors is an integer number (36935005).

Almost surely, 2^73870009 is an apocalyptic number.

It is an amenable number.

73870009 is a deficient number, since it is larger than the sum of its proper divisors (1).

73870009 is an equidigital number, since it uses as much as digits as its factorization.

73870009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 73870009 is about 8594.7663726247. The cubic root of 73870009 is about 419.5876697840.

The spelling of 73870009 in words is "seventy-three million, eight hundred seventy thousand, nine".