647778480 has 160 divisors (see below), whose sum is σ = 2099865600. Its totient is φ = 164997120.

The previous prime is 647778451. The next prime is 647778491. The reversal of 647778480 is 84877746.

It is a super-2 number, since 2×647778480² = 839233918302220800, which contains 22 as substring.

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, 616996 + ... + 618044.

It is an arithmetic number, because the mean of its divisors is an integer number (13124160).

Almost surely, 2^647778480 is an apocalyptic number.

647778480 is a gapful number since it is divisible by the number (60) 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 647778480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1049932800).

647778480 is an abundant number, since it is smaller than the sum of its proper divisors (1452087120).

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

647778480 is a wasteful number, since it uses less digits than its factorization.

647778480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 51.

The square root of 647778480 is about 25451.4926870704. The cubic root of 647778480 is about 865.2511238087.

The spelling of 647778480 in words is "six hundred forty-seven million, seven hundred seventy-eight thousand, four hundred eighty".