99678977 has 2 divisors, whose sum is σ = 99678978. Its totient is φ = 99678976.

The previous prime is 99678947. The next prime is 99678979. The reversal of 99678977 is 77987699.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80982001 + 18696976 = 8999^2 + 4324^2 .

It is a cyclic number.

It is not a de Polignac number, because 99678977 - 2¹² = 99674881 is a prime.

Together with 99678979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99678979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49839488 + 49839489.

It is an arithmetic number, because the mean of its divisors is an integer number (49839489).

Almost surely, 2^99678977 is an apocalyptic number.

It is an amenable number.

99678977 is a deficient number, since it is larger than the sum of its proper divisors (1).

99678977 is an equidigital number, since it uses as much as digits as its factorization.

99678977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12002256, while the sum is 62.

The square root of 99678977 is about 9983.9359473106. The cubic root of 99678977 is about 463.6616653290.

The spelling of 99678977 in words is "ninety-nine million, six hundred seventy-eight thousand, nine hundred seventy-seven".