56378009 has 4 divisors (see below), whose sum is σ = 56393316. Its totient is φ = 56362704.

The previous prime is 56377987. The next prime is 56378039. The reversal of 56378009 is 90087365.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17875984 + 38502025 = 4228^2 + 6205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56378009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56378039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1607 + ... + 10739.

It is an arithmetic number, because the mean of its divisors is an integer number (14098329).

Almost surely, 2^56378009 is an apocalyptic number.

It is an amenable number.

56378009 is a deficient number, since it is larger than the sum of its proper divisors (15307).

56378009 is an equidigital number, since it uses as much as digits as its factorization.

56378009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15306.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 56378009 is about 7508.5290836488. The cubic root of 56378009 is about 383.4451463785.

The spelling of 56378009 in words is "fifty-six million, three hundred seventy-eight thousand, nine".