78275537 has 2 divisors, whose sum is σ = 78275538. Its totient is φ = 78275536.

The previous prime is 78275501. The next prime is 78275543. The reversal of 78275537 is 73557287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41357761 + 36917776 = 6431^2 + 6076^2 .

It is an emirp because it is prime and its reverse (73557287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78275537 - 2⁶ = 78275473 is a prime.

It is a super-2 number, since 2×78275537² = 12254119385276738, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78275567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39137768 + 39137769.

It is an arithmetic number, because the mean of its divisors is an integer number (39137769).

Almost surely, 2^78275537 is an apocalyptic number.

It is an amenable number.

78275537 is a deficient number, since it is larger than the sum of its proper divisors (1).

78275537 is an equidigital number, since it uses as much as digits as its factorization.

78275537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 411600, while the sum is 44.

The square root of 78275537 is about 8847.3463253113. The cubic root of 78275537 is about 427.7683861259.

The spelling of 78275537 in words is "seventy-eight million, two hundred seventy-five thousand, five hundred thirty-seven".