7779487947 has 32 divisors (see below), whose sum is σ = 13281667584. Its totient is φ = 3932064000.

The previous prime is 7779487931. The next prime is 7779487967. The reversal of 7779487947 is 7497849777.

It is not a de Polignac number, because 7779487947 - 2⁴ = 7779487931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7779487967) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 446554 + ... + 463647.

It is an arithmetic number, because the mean of its divisors is an integer number (415052112).

Almost surely, 2^7779487947 is an apocalyptic number.

7779487947 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

7779487947 is a deficient number, since it is larger than the sum of its proper divisors (5502179637).

7779487947 is a wasteful number, since it uses less digits than its factorization.

7779487947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910259.

The product of its digits is 174254976, while the sum is 69.

The square root of 7779487947 is about 88201.4055840382. The cubic root of 7779487947 is about 1981.4525228369.

The spelling of 7779487947 in words is "seven billion, seven hundred seventy-nine million, four hundred eighty-seven thousand, nine hundred forty-seven".