78243037 has 2 divisors, whose sum is σ = 78243038. Its totient is φ = 78243036.

The previous prime is 78243017. The next prime is 78243043. The reversal of 78243037 is 73034287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55860676 + 22382361 = 7474^2 + 4731^2 .

It is a cyclic number.

It is not a de Polignac number, because 78243037 - 2¹⁹ = 77718749 is a prime.

It is a super-2 number, since 2×78243037² = 12243945677966738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78242993 and 78243011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78243017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39121518 + 39121519.

It is an arithmetic number, because the mean of its divisors is an integer number (39121519).

Almost surely, 2^78243037 is an apocalyptic number.

It is an amenable number.

78243037 is a deficient number, since it is larger than the sum of its proper divisors (1).

78243037 is an equidigital number, since it uses as much as digits as its factorization.

78243037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 78243037 is about 8845.5094256917. The cubic root of 78243037 is about 427.7091747911.

The spelling of 78243037 in words is "seventy-eight million, two hundred forty-three thousand, thirty-seven".