78365533 has 2 divisors, whose sum is σ = 78365534. Its totient is φ = 78365532.

The previous prime is 78365513. The next prime is 78365653. The reversal of 78365533 is 33556387.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 6827769 = 8458^2 + 2613^2 .

It is a cyclic number.

It is not a de Polignac number, because 78365533 - 2⁵ = 78365501 is a prime.

It is a super-2 number, since 2×78365533² = 12282313524748178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78365503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39182766 + 39182767.

It is an arithmetic number, because the mean of its divisors is an integer number (39182767).

Almost surely, 2^78365533 is an apocalyptic number.

It is an amenable number.

78365533 is a deficient number, since it is larger than the sum of its proper divisors (1).

78365533 is an equidigital number, since it uses as much as digits as its factorization.

78365533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

The square root of 78365533 is about 8852.4309090780. The cubic root of 78365533 is about 427.9322632052.

The spelling of 78365533 in words is "seventy-eight million, three hundred sixty-five thousand, five hundred thirty-three".