2678809129 has 4 divisors (see below), whose sum is σ = 2679029584. Its totient is φ = 2678588676.

The previous prime is 2678809123. The next prime is 2678809151. The reversal of 2678809129 is 9219088762.

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 2678809129 - 2³ = 2678809121 is a prime.

It is a super-2 number, since 2×2678809129² = 14352036699227477282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2678809121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90867 + ... + 116680.

It is an arithmetic number, because the mean of its divisors is an integer number (669757396).

Almost surely, 2^2678809129 is an apocalyptic number.

It is an amenable number.

2678809129 is a deficient number, since it is larger than the sum of its proper divisors (220455).

2678809129 is a wasteful number, since it uses less digits than its factorization.

2678809129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220454.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 2678809129 is about 51757.2133040410. The cubic root of 2678809129 is about 1388.8241403987.

The spelling of 2678809129 in words is "two billion, six hundred seventy-eight million, eight hundred nine thousand, one hundred twenty-nine".