86146778 has 4 divisors (see below), whose sum is σ = 129220170. Its totient is φ = 43073388.

The previous prime is 86146777. The next prime is 86146807. The reversal of 86146778 is 87764168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49942489 + 36204289 = 7067^2 + 6017^2 .

It is not an unprimeable number, because it can be changed into a prime (86146777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21536693 + ... + 21536696.

Almost surely, 2^86146778 is an apocalyptic number.

86146778 is a deficient number, since it is larger than the sum of its proper divisors (43073392).

86146778 is a wasteful number, since it uses less digits than its factorization.

86146778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43073391.

The product of its digits is 451584, while the sum is 47.

The square root of 86146778 is about 9281.5288611306. The cubic root of 86146778 is about 441.6514693398.

The spelling of 86146778 in words is "eighty-six million, one hundred forty-six thousand, seven hundred seventy-eight".