80784538 has 4 divisors (see below), whose sum is σ = 121176810. Its totient is φ = 40392268.

The previous prime is 80784503. The next prime is 80784553. The reversal of 80784538 is 83548708.

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., 79798489 + 986049 = 8933^2 + 993^2 .

It is a super-2 number, since 2×80784538² = 13052283159746888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 80784494 and 80784503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20196133 + ... + 20196136.

Almost surely, 2^80784538 is an apocalyptic number.

80784538 is a deficient number, since it is larger than the sum of its proper divisors (40392272).

80784538 is a wasteful number, since it uses less digits than its factorization.

80784538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40392271.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 80784538 is about 8988.0219180863. The cubic root of 80784538 is about 432.2908884761.

The spelling of 80784538 in words is "eighty million, seven hundred eighty-four thousand, five hundred thirty-eight".