78553863 has 6 divisors (see below), whose sum is σ = 113466704. Its totient is φ = 52369236.

The previous prime is 78553859. The next prime is 78553883. The reversal of 78553863 is 36835587.

It is not a de Polignac number, because 78553863 - 2² = 78553859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78553883) 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 in 5 ways as a sum of consecutive naturals, for example, 4364095 + ... + 4364112.

Almost surely, 2^78553863 is an apocalyptic number.

78553863 is a deficient number, since it is larger than the sum of its proper divisors (34912841).

78553863 is a wasteful number, since it uses less digits than its factorization.

78553863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8728213 (or 8728210 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 78553863 is about 8863.0617170366. The cubic root of 78553863 is about 428.2747947812.

The spelling of 78553863 in words is "seventy-eight million, five hundred fifty-three thousand, eight hundred sixty-three".