990777763 has 4 divisors (see below), whose sum is σ = 1022738368. Its totient is φ = 958817160.

The previous prime is 990777761. The next prime is 990777769. The reversal of 990777763 is 367777099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 367777099 = 17 ⋅21633947.

It is a cyclic number.

It is not a de Polignac number, because 990777763 - 2¹ = 990777761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990777761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15980256 + ... + 15980317.

It is an arithmetic number, because the mean of its divisors is an integer number (255684592).

Almost surely, 2^990777763 is an apocalyptic number.

990777763 is a deficient number, since it is larger than the sum of its proper divisors (31960605).

990777763 is a wasteful number, since it uses less digits than its factorization.

990777763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31960604.

The product of its (nonzero) digits is 3500658, while the sum is 55.

The square root of 990777763 is about 31476.6224839960. The cubic root of 990777763 is about 996.9164223221.

The spelling of 990777763 in words is "nine hundred ninety million, seven hundred seventy-seven thousand, seven hundred sixty-three".