74778871 has 2 divisors, whose sum is σ = 74778872. Its totient is φ = 74778870.

The previous prime is 74778859. The next prime is 74778917. The reversal of 74778871 is 17887747.

It is a weak prime.

It is an emirp because it is prime and its reverse (17887747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74778871 - 2⁵ = 74778839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74778841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37389435 + 37389436.

It is an arithmetic number, because the mean of its divisors is an integer number (37389436).

Almost surely, 2^74778871 is an apocalyptic number.

74778871 is a deficient number, since it is larger than the sum of its proper divisors (1).

74778871 is an equidigital number, since it uses as much as digits as its factorization.

74778871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 614656, while the sum is 49.

The square root of 74778871 is about 8647.4777247473. The cubic root of 74778871 is about 421.3014637146.

The spelling of 74778871 in words is "seventy-four million, seven hundred seventy-eight thousand, eight hundred seventy-one".