2478658609 has 4 divisors (see below), whose sum is σ = 2832752704. Its totient is φ = 2124564516.

The previous prime is 2478658591. The next prime is 2478658621. The reversal of 2478658609 is 9068568742.

2478658609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2478658609 - 2⁵ = 2478658577 is a prime.

It is a super-2 number, since 2×2478658609² = 12287496999939629762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2478658609.

It is not an unprimeable number, because it can be changed into a prime (2478658669) 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, 177047037 + ... + 177047050.

It is an arithmetic number, because the mean of its divisors is an integer number (708188176).

Almost surely, 2^2478658609 is an apocalyptic number.

It is an amenable number.

2478658609 is a deficient number, since it is larger than the sum of its proper divisors (354094095).

2478658609 is an equidigital number, since it uses as much as digits as its factorization.

2478658609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354094094.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The square root of 2478658609 is about 49786.1286805873. The cubic root of 2478658609 is about 1353.3358034136.

The spelling of 2478658609 in words is "two billion, four hundred seventy-eight million, six hundred fifty-eight thousand, six hundred nine".