78855039 has 20 divisors (see below), whose sum is σ = 118040824. Its totient is φ = 52460784.

The previous prime is 78855037. The next prime is 78855059. The reversal of 78855039 is 93055887.

It is not a de Polignac number, because 78855039 - 2¹ = 78855037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78854985 and 78855003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78855037) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 63129 + ... + 64365.

Almost surely, 2^78855039 is an apocalyptic number.

78855039 is a deficient number, since it is larger than the sum of its proper divisors (39185785).

78855039 is a wasteful number, since it uses less digits than its factorization.

78855039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 2027 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 78855039 is about 8880.0359796568. The cubic root of 78855039 is about 428.8214328476.

The spelling of 78855039 in words is "seventy-eight million, eight hundred fifty-five thousand, thirty-nine".