78136537 has 2 divisors, whose sum is σ = 78136538. Its totient is φ = 78136536.

The previous prime is 78136477. The next prime is 78136549. The reversal of 78136537 is 73563187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41847961 + 36288576 = 6469^2 + 6024^2 .

It is a cyclic number.

It is not a de Polignac number, because 78136537 - 2¹⁵ = 78103769 is a prime.

It is a super-2 number, since 2×78136537² = 12210636828704738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78136537.

It is not a weakly prime, because it can be changed into another prime (78136567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39068268 + 39068269.

It is an arithmetic number, because the mean of its divisors is an integer number (39068269).

Almost surely, 2^78136537 is an apocalyptic number.

It is an amenable number.

78136537 is a deficient number, since it is larger than the sum of its proper divisors (1).

78136537 is an equidigital number, since it uses as much as digits as its factorization.

78136537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 40.

The square root of 78136537 is about 8839.4873720143. The cubic root of 78136537 is about 427.5150288254.

The spelling of 78136537 in words is "seventy-eight million, one hundred thirty-six thousand, five hundred thirty-seven".