80436578 has 4 divisors (see below), whose sum is σ = 120654870. Its totient is φ = 40218288.

The previous prime is 80436553. The next prime is 80436619. The reversal of 80436578 is 87563408.

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., 66471409 + 13965169 = 8153^2 + 3737^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20109143 + ... + 20109146.

Almost surely, 2^80436578 is an apocalyptic number.

80436578 is a deficient number, since it is larger than the sum of its proper divisors (40218292).

80436578 is a wasteful number, since it uses less digits than its factorization.

80436578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40218291.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 80436578 is about 8968.6441561699. The cubic root of 80436578 is about 431.6693321508.

The spelling of 80436578 in words is "eighty million, four hundred thirty-six thousand, five hundred seventy-eight".