78244961 has 4 divisors (see below), whose sum is σ = 80769024. Its totient is φ = 75720900.

The previous prime is 78244939. The next prime is 78244963. The reversal of 78244961 is 16944287.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78244961 is a prime.

It is a super-2 number, since 2×78244961² = 12244547843783042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78244963) 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, 1261985 + ... + 1262046.

It is an arithmetic number, because the mean of its divisors is an integer number (20192256).

Almost surely, 2^78244961 is an apocalyptic number.

It is an amenable number.

78244961 is a deficient number, since it is larger than the sum of its proper divisors (2524063).

78244961 is a wasteful number, since it uses less digits than its factorization.

78244961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524062.

The product of its digits is 96768, while the sum is 41.

The square root of 78244961 is about 8845.6181807718. The cubic root of 78244961 is about 427.7126805586.

The spelling of 78244961 in words is "seventy-eight million, two hundred forty-four thousand, nine hundred sixty-one".