78275933 has 2 divisors, whose sum is σ = 78275934. Its totient is φ = 78275932.

The previous prime is 78275927. The next prime is 78275941. The reversal of 78275933 is 33957287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78198649 + 77284 = 8843^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 78275933 - 2⁴ = 78275917 is a prime.

It is a super-2 number, since 2×78275933² = 12254243374040978, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78275903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39137966 + 39137967.

It is an arithmetic number, because the mean of its divisors is an integer number (39137967).

Almost surely, 2^78275933 is an apocalyptic number.

It is an amenable number.

78275933 is a deficient number, since it is larger than the sum of its proper divisors (1).

78275933 is an equidigital number, since it uses as much as digits as its factorization.

78275933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 78275933 is about 8847.3687048749. The cubic root of 78275933 is about 427.7691074922.

The spelling of 78275933 in words is "seventy-eight million, two hundred seventy-five thousand, nine hundred thirty-three".