97780087 has 2 divisors, whose sum is σ = 97780088. Its totient is φ = 97780086.

The previous prime is 97780057. The next prime is 97780091. The reversal of 97780087 is 78008779.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78008779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97780087 - 2¹¹ = 97778039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97780057) 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, 48890043 + 48890044.

It is an arithmetic number, because the mean of its divisors is an integer number (48890044).

Almost surely, 2^97780087 is an apocalyptic number.

97780087 is a deficient number, since it is larger than the sum of its proper divisors (1).

97780087 is an equidigital number, since it uses as much as digits as its factorization.

97780087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 97780087 is about 9888.3814145693. The cubic root of 97780087 is about 460.6985087229.

The spelling of 97780087 in words is "ninety-seven million, seven hundred eighty thousand, eighty-seven".