99967977 has 6 divisors (see below), whose sum is σ = 144398202. Its totient is φ = 66645312.

The previous prime is 99967961. The next prime is 99967981. The reversal of 99967977 is 77976999.

It can be written as a sum of positive squares in only one way, i.e., 99920016 + 47961 = 9996^2 + 219^2 .

It is not a de Polignac number, because 99967977 - 2⁴ = 99967961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99967927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5553768 + ... + 5553785.

It is an arithmetic number, because the mean of its divisors is an integer number (24066367).

Almost surely, 2^99967977 is an apocalyptic number.

It is an amenable number.

99967977 is a deficient number, since it is larger than the sum of its proper divisors (44430225).

99967977 is a wasteful number, since it uses less digits than its factorization.

99967977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11107559 (or 11107556 counting only the distinct ones).

The product of its digits is 13502538, while the sum is 63.

The square root of 99967977 is about 9998.3987217954. The cubic root of 99967977 is about 464.1093322052.

The spelling of 99967977 in words is "ninety-nine million, nine hundred sixty-seven thousand, nine hundred seventy-seven".