77228147 has 4 divisors (see below), whose sum is σ = 77334240. Its totient is φ = 77122056.

The previous prime is 77228117. The next prime is 77228149. The reversal of 77228147 is 74182277.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74182277 = 13 ⋅5706329.

It is a cyclic number.

It is not a de Polignac number, because 77228147 - 2²⁶ = 10119283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77228147.

It is not an unprimeable number, because it can be changed into a prime (77228149) 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, 51947 + ... + 53412.

It is an arithmetic number, because the mean of its divisors is an integer number (19333560).

Almost surely, 2^77228147 is an apocalyptic number.

77228147 is a deficient number, since it is larger than the sum of its proper divisors (106093).

77228147 is a wasteful number, since it uses less digits than its factorization.

77228147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106092.

The product of its digits is 43904, while the sum is 38.

The square root of 77228147 is about 8787.9546539567. The cubic root of 77228147 is about 425.8518499290.

The spelling of 77228147 in words is "seventy-seven million, two hundred twenty-eight thousand, one hundred forty-seven".