99977755 has 4 divisors (see below), whose sum is σ = 119973312. Its totient is φ = 79982200.

The previous prime is 99977749. The next prime is 99977771. The reversal of 99977755 is 55777999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55777999 = 41 ⋅1360439.

It is not a de Polignac number, because 99977755 - 2⁷ = 99977627 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99977755.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9997771 + ... + 9997780.

It is an arithmetic number, because the mean of its divisors is an integer number (29993328).

Almost surely, 2^99977755 is an apocalyptic number.

99977755 is a deficient number, since it is larger than the sum of its proper divisors (19995557).

99977755 is a wasteful number, since it uses less digits than its factorization.

99977755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19995556.

The product of its digits is 6251175, while the sum is 58.

The square root of 99977755 is about 9998.8876881381. The cubic root of 99977755 is about 464.1244634277.

The spelling of 99977755 in words is "ninety-nine million, nine hundred seventy-seven thousand, seven hundred fifty-five".