87920977 has 2 divisors, whose sum is σ = 87920978. Its totient is φ = 87920976.

The previous prime is 87920969. The next prime is 87921013. The reversal of 87920977 is 77902978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83010321 + 4910656 = 9111^2 + 2216^2 .

It is a cyclic number.

It is not a de Polignac number, because 87920977 - 2³ = 87920969 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87920977.

It is not a weakly prime, because it can be changed into another prime (87920477) 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 as a sum of consecutive naturals, namely, 43960488 + 43960489.

It is an arithmetic number, because the mean of its divisors is an integer number (43960489).

Almost surely, 2^87920977 is an apocalyptic number.

It is an amenable number.

87920977 is a deficient number, since it is larger than the sum of its proper divisors (1).

87920977 is an equidigital number, since it uses as much as digits as its factorization.

87920977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 87920977 is about 9376.6186336013. The cubic root of 87920977 is about 444.6628376511.

The spelling of 87920977 in words is "eighty-seven million, nine hundred twenty thousand, nine hundred seventy-seven".