980778787 has 4 divisors (see below), whose sum is σ = 1003587640. Its totient is φ = 957969936.

The previous prime is 980778779. The next prime is 980778793. The reversal of 980778787 is 787877089.

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: 787877089 = 43 ⋅18322723.

It is a cyclic number.

It is not a de Polignac number, because 980778787 - 2³ = 980778779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (980778767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11404362 + ... + 11404447.

It is an arithmetic number, because the mean of its divisors is an integer number (250896910).

Almost surely, 2^980778787 is an apocalyptic number.

980778787 is a deficient number, since it is larger than the sum of its proper divisors (22808853).

980778787 is a wasteful number, since it uses less digits than its factorization.

980778787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22808852.

The product of its (nonzero) digits is 11063808, while the sum is 61.

The square root of 980778787 is about 31317.3879338619. The cubic root of 980778787 is about 993.5514343873.

The spelling of 980778787 in words is "nine hundred eighty million, seven hundred seventy-eight thousand, seven hundred eighty-seven".