78245887 has 2 divisors, whose sum is σ = 78245888. Its totient is φ = 78245886.

The previous prime is 78245879. The next prime is 78245903. The reversal of 78245887 is 78854287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78245887 - 2³ = 78245879 is a prime.

It is a super-3 number, since 3×78245887³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78245887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78245807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39122943 + 39122944.

It is an arithmetic number, because the mean of its divisors is an integer number (39122944).

Almost surely, 2^78245887 is an apocalyptic number.

78245887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78245887 is an equidigital number, since it uses as much as digits as its factorization.

78245887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1003520, while the sum is 49.

The square root of 78245887 is about 8845.6705229168. The cubic root of 78245887 is about 427.7143678255.

Subtracting 78245887 from its reverse (78854287), we obtain a square (608400 = 780²).

The spelling of 78245887 in words is "seventy-eight million, two hundred forty-five thousand, eight hundred eighty-seven".