78204697 has 2 divisors, whose sum is σ = 78204698. Its totient is φ = 78204696.

The previous prime is 78204691. The next prime is 78204719. The reversal of 78204697 is 79640287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61402896 + 16801801 = 7836^2 + 4099^2 .

It is a cyclic number.

It is not a de Polignac number, because 78204697 - 2³ = 78204689 is a prime.

It is a super-2 number, since 2×78204697² = 12231949265723618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78204691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39102348 + 39102349.

It is an arithmetic number, because the mean of its divisors is an integer number (39102349).

Almost surely, 2^78204697 is an apocalyptic number.

It is an amenable number.

78204697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78204697 is an equidigital number, since it uses as much as digits as its factorization.

78204697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 78204697 is about 8843.3419587846. The cubic root of 78204697 is about 427.6393025503.

The spelling of 78204697 in words is "seventy-eight million, two hundred four thousand, six hundred ninety-seven".