78827477 has 2 divisors, whose sum is σ = 78827478. Its totient is φ = 78827476.

The previous prime is 78827431. The next prime is 78827479. The reversal of 78827477 is 77472887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72607441 + 6220036 = 8521^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 78827477 - 2¹⁰ = 78826453 is a prime.

It is a super-2 number, since 2×78827477² = 12427542260371058, which contains 22 as substring.

Together with 78827479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78827479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39413738 + 39413739.

It is an arithmetic number, because the mean of its divisors is an integer number (39413739).

Almost surely, 2^78827477 is an apocalyptic number.

It is an amenable number.

78827477 is a deficient number, since it is larger than the sum of its proper divisors (1).

78827477 is an equidigital number, since it uses as much as digits as its factorization.

78827477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1229312, while the sum is 50.

The square root of 78827477 is about 8878.4839358981. The cubic root of 78827477 is about 428.7714654061.

The spelling of 78827477 in words is "seventy-eight million, eight hundred twenty-seven thousand, four hundred seventy-seven".