78619963 has 4 divisors (see below), whose sum is σ = 78688728. Its totient is φ = 78551200.

The previous prime is 78619939. The next prime is 78619969. The reversal of 78619963 is 36991687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36991687 = 3299 ⋅11213.

It is a cyclic number.

It is not a de Polignac number, because 78619963 - 2²¹ = 76522811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78619969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32638 + ... + 34963.

It is an arithmetic number, because the mean of its divisors is an integer number (19672182).

Almost surely, 2^78619963 is an apocalyptic number.

78619963 is a deficient number, since it is larger than the sum of its proper divisors (68765).

78619963 is a wasteful number, since it uses less digits than its factorization.

78619963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68764.

The product of its digits is 489888, while the sum is 49.

The square root of 78619963 is about 8866.7898926274. The cubic root of 78619963 is about 428.3948865937.

The spelling of 78619963 in words is "seventy-eight million, six hundred nineteen thousand, nine hundred sixty-three".