78643563 has 8 divisors (see below), whose sum is σ = 108474000. Its totient is φ = 50621088.

The previous prime is 78643561. The next prime is 78643567. The reversal of 78643563 is 36534687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78643563 - 2¹ = 78643561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78643561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451888 + ... + 452061.

It is an arithmetic number, because the mean of its divisors is an integer number (13559250).

Almost surely, 2^78643563 is an apocalyptic number.

78643563 is a deficient number, since it is larger than the sum of its proper divisors (29830437).

78643563 is a wasteful number, since it uses less digits than its factorization.

78643563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903981.

The product of its digits is 362880, while the sum is 42.

The square root of 78643563 is about 8868.1206013450. The cubic root of 78643563 is about 428.4377472425.

The spelling of 78643563 in words is "seventy-eight million, six hundred forty-three thousand, five hundred sixty-three".