80749978 has 32 divisors (see below), whose sum is σ = 130959360. Its totient is φ = 37255680.

The previous prime is 80749927. The next prime is 80749979. The reversal of 80749978 is 87994708.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (80749979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174175 + ... + 174637.

It is an arithmetic number, because the mean of its divisors is an integer number (4092480).

Almost surely, 2^80749978 is an apocalyptic number.

80749978 is a deficient number, since it is larger than the sum of its proper divisors (50209382).

80749978 is a wasteful number, since it uses less digits than its factorization.

80749978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 80749978 is about 8986.0991536929. The cubic root of 80749978 is about 432.2292343344.

The spelling of 80749978 in words is "eighty million, seven hundred forty-nine thousand, nine hundred seventy-eight".