47777779 has 4 divisors (see below), whose sum is σ = 54603184. Its totient is φ = 40952376.

The previous prime is 47777749. The next prime is 47777783. The reversal of 47777779 is 97777774.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97777774 = 2 ⋅48888887.

It is a cyclic number.

It is not a de Polignac number, because 47777779 - 2¹³ = 47769587 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (47777749) 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, 3412692 + ... + 3412705.

It is an arithmetic number, because the mean of its divisors is an integer number (13650796).

Almost surely, 2^47777779 is an apocalyptic number.

47777779 is a deficient number, since it is larger than the sum of its proper divisors (6825405).

47777779 is an equidigital number, since it uses as much as digits as its factorization.

47777779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825404.

The product of its digits is 4235364, while the sum is 55.

The square root of 47777779 is about 6912.1472061871. The cubic root of 47777779 is about 362.8624142452.

The spelling of 47777779 in words is "forty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-nine".