80436978 has 12 divisors (see below), whose sum is σ = 174280158. Its totient is φ = 26812320.

The previous prime is 80436977. The next prime is 80437009. The reversal of 80436978 is 87963408.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 79869969 + 567009 = 8937^2 + 753^2 .

It is not an unprimeable number, because it can be changed into a prime (80436973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2234343 + ... + 2234378.

Almost surely, 2^80436978 is an apocalyptic number.

80436978 is an abundant number, since it is smaller than the sum of its proper divisors (93843180).

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

80436978 is a wasteful number, since it uses less digits than its factorization.

80436978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468729 (or 4468726 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 80436978 is about 8968.6664560569. Note that the first 3 decimals coincide. The cubic root of 80436978 is about 431.6700476936.

The spelling of 80436978 in words is "eighty million, four hundred thirty-six thousand, nine hundred seventy-eight".