78785961 has 4 divisors (see below), whose sum is σ = 105047952. Its totient is φ = 52523972.

The previous prime is 78785947. The next prime is 78785981. The reversal of 78785961 is 16958787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16958787 = 3 ⋅5652929.

It is a cyclic number.

It is not a de Polignac number, because 78785961 - 2⁵ = 78785929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78785981) 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 3 ways as a sum of consecutive naturals, for example, 13130991 + ... + 13130996.

It is an arithmetic number, because the mean of its divisors is an integer number (26261988).

Almost surely, 2^78785961 is an apocalyptic number.

It is an amenable number.

78785961 is a deficient number, since it is larger than the sum of its proper divisors (26261991).

78785961 is a wasteful number, since it uses less digits than its factorization.

78785961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26261990.

The product of its digits is 846720, while the sum is 51.

The square root of 78785961 is about 8876.1456162008. The cubic root of 78785961 is about 428.6961786203.

The spelling of 78785961 in words is "seventy-eight million, seven hundred eighty-five thousand, nine hundred sixty-one".