1780478664 has 64 divisors (see below), whose sum is σ = 4625208000. Its totient is φ = 570474240.

The previous prime is 1780478647. The next prime is 1780478677. The reversal of 1780478664 is 4668740871.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153799 + ... + 164969.

It is an arithmetic number, because the mean of its divisors is an integer number (72268875).

Almost surely, 2^1780478664 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 1780478664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2312604000).

1780478664 is an abundant number, since it is smaller than the sum of its proper divisors (2844729336).

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

1780478664 is a wasteful number, since it uses less digits than its factorization.

1780478664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11438 (or 11434 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The square root of 1780478664 is about 42195.7185505828. The cubic root of 1780478664 is about 1212.0268976374.

The spelling of 1780478664 in words is "one billion, seven hundred eighty million, four hundred seventy-eight thousand, six hundred sixty-four".