7778173480 has 128 divisors (see below), whose sum is σ = 21859994880. Its totient is φ = 2419845120.

The previous prime is 7778173399. The next prime is 7778173541. The reversal of 7778173480 is 843718777.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1898314 + ... + 1902406.

It is an arithmetic number, because the mean of its divisors is an integer number (170781210).

Almost surely, 2^7778173480 is an apocalyptic number.

7778173480 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7778173480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10929997440).

7778173480 is an abundant number, since it is smaller than the sum of its proper divisors (14081821400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7778173480 is a wasteful number, since it uses less digits than its factorization.

7778173480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739 (or 4735 counting only the distinct ones).

The product of its (nonzero) digits is 1843968, while the sum is 52.

The square root of 7778173480 is about 88193.9537610147. The cubic root of 7778173480 is about 1981.3409173483.

The spelling of 7778173480 in words is "seven billion, seven hundred seventy-eight million, one hundred seventy-three thousand, four hundred eighty".