86778049 has 2 divisors, whose sum is σ = 86778050. Its totient is φ = 86778048.

The previous prime is 86778031. The next prime is 86778053. The reversal of 86778049 is 94087768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56175025 + 30603024 = 7495^2 + 5532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86778049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 86777993 and 86778011.

It is not a weakly prime, because it can be changed into another prime (86778059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43389024 + 43389025.

It is an arithmetic number, because the mean of its divisors is an integer number (43389025).

Almost surely, 2^86778049 is an apocalyptic number.

It is an amenable number.

86778049 is a deficient number, since it is larger than the sum of its proper divisors (1).

86778049 is an equidigital number, since it uses as much as digits as its factorization.

86778049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 86778049 is about 9315.4736326179. The cubic root of 86778049 is about 442.7276307622.

The spelling of 86778049 in words is "eighty-six million, seven hundred seventy-eight thousand, forty-nine".