82878773 has 2 divisors, whose sum is σ = 82878774. Its totient is φ = 82878772.

The previous prime is 82878769. The next prime is 82878787. The reversal of 82878773 is 37787828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80694289 + 2184484 = 8983^2 + 1478^2 .

It is a cyclic number.

It is not a de Polignac number, because 82878773 - 2² = 82878769 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82878973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41439386 + 41439387.

It is an arithmetic number, because the mean of its divisors is an integer number (41439387).

Almost surely, 2^82878773 is an apocalyptic number.

It is an amenable number.

82878773 is a deficient number, since it is larger than the sum of its proper divisors (1).

82878773 is an equidigital number, since it uses as much as digits as its factorization.

82878773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 50.

The square root of 82878773 is about 9103.7779520373. Note that the first 3 decimals coincide. The cubic root of 82878773 is about 435.9945938925.

The spelling of 82878773 in words is "eighty-two million, eight hundred seventy-eight thousand, seven hundred seventy-three".