7779644489 has 4 divisors (see below), whose sum is σ = 7784891856. Its totient is φ = 7774397124.

The previous prime is 7779644417. The next prime is 7779644501. The reversal of 7779644489 is 9844469777.

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 7779644489 - 2⁸ = 7779644233 is a prime.

It is a super-2 number, since 2×7779644489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7779644989) 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, 2621459 + ... + 2624424.

It is an arithmetic number, because the mean of its divisors is an integer number (1946222964).

Almost surely, 2^7779644489 is an apocalyptic number.

It is an amenable number.

7779644489 is a deficient number, since it is larger than the sum of its proper divisors (5247367).

7779644489 is a wasteful number, since it uses less digits than its factorization.

7779644489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5247366.

The product of its digits is 85349376, while the sum is 65.

The square root of 7779644489 is about 88202.2929917358. The cubic root of 7779644489 is about 1981.4658132772.

The spelling of 7779644489 in words is "seven billion, seven hundred seventy-nine million, six hundred forty-four thousand, four hundred eighty-nine".