78204653 has 2 divisors, whose sum is σ = 78204654. Its totient is φ = 78204652.

The previous prime is 78204631. The next prime is 78204667. The reversal of 78204653 is 35640287.

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., 48469444 + 29735209 = 6962^2 + 5453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78204653 is a prime.

It is a super-2 number, since 2×78204653² = 12231935501700818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78204673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39102326 + 39102327.

It is an arithmetic number, because the mean of its divisors is an integer number (39102327).

Almost surely, 2^78204653 is an apocalyptic number.

It is an amenable number.

78204653 is a deficient number, since it is larger than the sum of its proper divisors (1).

78204653 is an equidigital number, since it uses as much as digits as its factorization.

78204653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 78204653 is about 8843.3394710369. The cubic root of 78204653 is about 427.6392223500.

The spelling of 78204653 in words is "seventy-eight million, two hundred four thousand, six hundred fifty-three".