78531963 has 4 divisors (see below), whose sum is σ = 104709288. Its totient is φ = 52354640.

The previous prime is 78531953. The next prime is 78531989. The reversal of 78531963 is 36913587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36913587 = 3 ⋅12304529.

It is a cyclic number.

It is not a de Polignac number, because 78531963 - 2⁵ = 78531931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78531923) 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, 13088658 + ... + 13088663.

It is an arithmetic number, because the mean of its divisors is an integer number (26177322).

Almost surely, 2^78531963 is an apocalyptic number.

78531963 is a deficient number, since it is larger than the sum of its proper divisors (26177325).

78531963 is a wasteful number, since it uses less digits than its factorization.

78531963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26177324.

The product of its digits is 136080, while the sum is 42.

The square root of 78531963 is about 8861.8261662030. The cubic root of 78531963 is about 428.2349915626.

The spelling of 78531963 in words is "seventy-eight million, five hundred thirty-one thousand, nine hundred sixty-three".