78144533 has 2 divisors, whose sum is σ = 78144534. Its totient is φ = 78144532.

The previous prime is 78144527. The next prime is 78144541. The reversal of 78144533 is 33544187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47430769 + 30713764 = 6887^2 + 5542^2 .

It is a cyclic number.

It is not a de Polignac number, because 78144533 - 2²² = 73950229 is a prime.

It is a super-2 number, since 2×78144533² = 12213136075576178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78144493 and 78144502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78144553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39072266 + 39072267.

It is an arithmetic number, because the mean of its divisors is an integer number (39072267).

Almost surely, 2^78144533 is an apocalyptic number.

It is an amenable number.

78144533 is a deficient number, since it is larger than the sum of its proper divisors (1).

78144533 is an equidigital number, since it uses as much as digits as its factorization.

78144533 is an evil number, because the sum of its binary digits is even.

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

The square root of 78144533 is about 8839.9396491153. The cubic root of 78144533 is about 427.5296113912.

The spelling of 78144533 in words is "seventy-eight million, one hundred forty-four thousand, five hundred thirty-three".