8120578 has 4 divisors (see below), whose sum is σ = 12180870. Its totient is φ = 4060288.

The previous prime is 8120573. The next prime is 8120591. The reversal of 8120578 is 8750218.

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., 4092529 + 4028049 = 2023^2 + 2007^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (8120573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2030143 + ... + 2030146.

Almost surely, 2^8120578 is an apocalyptic number.

8120578 is a deficient number, since it is larger than the sum of its proper divisors (4060292).

8120578 is a wasteful number, since it uses less digits than its factorization.

8120578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060291.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 8120578 is about 2849.6627870680. The cubic root of 8120578 is about 200.9998102355. Note that the first 3 decimals are identical.

The spelling of 8120578 in words is "eight million, one hundred twenty thousand, five hundred seventy-eight".