78250771 has 2 divisors, whose sum is σ = 78250772. Its totient is φ = 78250770.

The previous prime is 78250769. The next prime is 78250793. The reversal of 78250771 is 17705287.

It is a weak prime.

It is an emirp because it is prime and its reverse (17705287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78250771 - 2¹ = 78250769 is a prime.

It is a super-2 number, since 2×78250771² = 12246366324188882, which contains 22 as substring.

Together with 78250769, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78250771.

It is not a weakly prime, because it can be changed into another prime (78250741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39125385 + 39125386.

It is an arithmetic number, because the mean of its divisors is an integer number (39125386).

Almost surely, 2^78250771 is an apocalyptic number.

78250771 is a deficient number, since it is larger than the sum of its proper divisors (1).

78250771 is an equidigital number, since it uses as much as digits as its factorization.

78250771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 78250771 is about 8845.9465858663. The cubic root of 78250771 is about 427.7232667533.

The spelling of 78250771 in words is "seventy-eight million, two hundred fifty thousand, seven hundred seventy-one".