78607409 has 2 divisors, whose sum is σ = 78607410. Its totient is φ = 78607408.

The previous prime is 78607379. The next prime is 78607447. The reversal of 78607409 is 90470687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72726784 + 5880625 = 8528^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 78607409 - 2¹² = 78603313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78607489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39303704 + 39303705.

It is an arithmetic number, because the mean of its divisors is an integer number (39303705).

Almost surely, 2^78607409 is an apocalyptic number.

It is an amenable number.

78607409 is a deficient number, since it is larger than the sum of its proper divisors (1).

78607409 is an equidigital number, since it uses as much as digits as its factorization.

78607409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 78607409 is about 8866.0819418726. The cubic root of 78607409 is about 428.3720834129.

The spelling of 78607409 in words is "seventy-eight million, six hundred seven thousand, four hundred nine".