78250791 has 8 divisors (see below), whose sum is σ = 104385024. Its totient is φ = 52141880.

The previous prime is 78250771. The next prime is 78250793. The reversal of 78250791 is 19705287.

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

It is a cyclic number.

It is not a de Polignac number, because 78250791 - 2⁹ = 78250279 is a prime.

It is a super-2 number, since 2×78250791² = 12246372584251362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78250793) 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, 2740 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (13048128).

Almost surely, 2^78250791 is an apocalyptic number.

78250791 is a deficient number, since it is larger than the sum of its proper divisors (26134233).

78250791 is a wasteful number, since it uses less digits than its factorization.

78250791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12661.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 78250791 is about 8845.9477163275. The cubic root of 78250791 is about 427.7233031937.

The spelling of 78250791 in words is "seventy-eight million, two hundred fifty thousand, seven hundred ninety-one".