78237113 has 2 divisors, whose sum is σ = 78237114. Its totient is φ = 78237112.

The previous prime is 78237109. The next prime is 78237119. The reversal of 78237113 is 31173287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49378729 + 28858384 = 7027^2 + 5372^2 .

It is a cyclic number.

It is not a de Polignac number, because 78237113 - 2² = 78237109 is a prime.

It is a super-2 number, since 2×78237113² = 12242091701149538, 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 78237113.

It is not a weakly prime, because it can be changed into another prime (78237119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39118556 + 39118557.

It is an arithmetic number, because the mean of its divisors is an integer number (39118557).

Almost surely, 2^78237113 is an apocalyptic number.

It is an amenable number.

78237113 is a deficient number, since it is larger than the sum of its proper divisors (1).

78237113 is an equidigital number, since it uses as much as digits as its factorization.

78237113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 78237113 is about 8845.1745601769. The cubic root of 78237113 is about 427.6983801645.

The spelling of 78237113 in words is "seventy-eight million, two hundred thirty-seven thousand, one hundred thirteen".