78687097 has 2 divisors, whose sum is σ = 78687098. Its totient is φ = 78687096.

The previous prime is 78687047. The next prime is 78687131. The reversal of 78687097 is 79078687.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 12931216 = 8109^2 + 3596^2 .

It is an emirp because it is prime and its reverse (79078687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78687097 - 2⁷ = 78686969 is a prime.

It is not a weakly prime, because it can be changed into another prime (78687017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39343548 + 39343549.

It is an arithmetic number, because the mean of its divisors is an integer number (39343549).

Almost surely, 2^78687097 is an apocalyptic number.

It is an amenable number.

78687097 is a deficient number, since it is larger than the sum of its proper divisors (1).

78687097 is an equidigital number, since it uses as much as digits as its factorization.

78687097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 78687097 is about 8870.5747840825. The cubic root of 78687097 is about 428.5167881186.

The spelling of 78687097 in words is "seventy-eight million, six hundred eighty-seven thousand, ninety-seven".