80778996 has 36 divisors (see below), whose sum is σ = 208048932. Its totient is φ = 26417664.

The previous prime is 80778991. The next prime is 80779021. The reversal of 80778996 is 69987708.

It can be written as a sum of positive squares in 2 ways, for example, as 62631396 + 18147600 = 7914^2 + 4260^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80778991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19261 + ... + 23076.

It is an arithmetic number, because the mean of its divisors is an integer number (5779137).

Almost surely, 2^80778996 is an apocalyptic number.

It is an amenable number.

80778996 is an abundant number, since it is smaller than the sum of its proper divisors (127269936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80778996 is a wasteful number, since it uses less digits than its factorization.

80778996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42400 (or 42395 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 80778996 is about 8987.7136135950. The cubic root of 80778996 is about 432.2810028761.

The spelling of 80778996 in words is "eighty million, seven hundred seventy-eight thousand, nine hundred ninety-six".