80297978 has 4 divisors (see below), whose sum is σ = 120446970. Its totient is φ = 40148988.

The previous prime is 80297977. The next prime is 80297981. The reversal of 80297978 is 87979208.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 43731769 + 36566209 = 6613^2 + 6047^2 .

It is not an unprimeable number, because it can be changed into a prime (80297977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20074493 + ... + 20074496.

Almost surely, 2^80297978 is an apocalyptic number.

80297978 is a deficient number, since it is larger than the sum of its proper divisors (40148992).

80297978 is a wasteful number, since it uses less digits than its factorization.

80297978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40148991.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 80297978 is about 8960.9139042845. The cubic root of 80297978 is about 431.4212536116.

The spelling of 80297978 in words is "eighty million, two hundred ninety-seven thousand, nine hundred seventy-eight".