1478661984 has 144 divisors (see below), whose sum is σ = 4338734400. Its totient is φ = 477404928.

The previous prime is 1478661979. The next prime is 1478662001. The reversal of 1478661984 is 4891668741.

1478661984 is a `hidden beast` number, since 14 + 7 + 8 + 6 + 619 + 8 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 1478661984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1720947 + ... + 1721805.

It is an arithmetic number, because the mean of its divisors is an integer number (30130100).

Almost surely, 2^1478661984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1478661984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2169367200).

1478661984 is an abundant number, since it is smaller than the sum of its proper divisors (2860072416).

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

1478661984 is a wasteful number, since it uses less digits than its factorization.

1478661984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 1046 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 1478661984 is about 38453.3741562428. The cubic root of 1478661984 is about 1139.2603142513.

The spelling of 1478661984 in words is "one billion, four hundred seventy-eight million, six hundred sixty-one thousand, nine hundred eighty-four".