78578961 has 8 divisors (see below), whose sum is σ = 105047040. Its totient is φ = 52248432.

The previous prime is 78578959. The next prime is 78578977. The reversal of 78578961 is 16987587.

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

It is not a de Polignac number, because 78578961 - 2¹ = 78578959 is a prime.

It is a super-2 number, since 2×78578961² = 12349306223679042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78578161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33046 + ... + 35343.

It is an arithmetic number, because the mean of its divisors is an integer number (13130880).

Almost surely, 2^78578961 is an apocalyptic number.

It is an amenable number.

78578961 is a deficient number, since it is larger than the sum of its proper divisors (26468079).

78578961 is a wasteful number, since it uses less digits than its factorization.

78578961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68775.

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

The square root of 78578961 is about 8864.4774803707. The cubic root of 78578961 is about 428.3204012642.

The spelling of 78578961 in words is "seventy-eight million, five hundred seventy-eight thousand, nine hundred sixty-one".