1664078280 has 64 divisors (see below), whose sum is σ = 5004244800. Its totient is φ = 442686720.

The previous prime is 1664078243. The next prime is 1664078327. The reversal of 1664078280 is 828704661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34051 + ... + 66989.

It is an arithmetic number, because the mean of its divisors is an integer number (78191325).

Almost surely, 2^1664078280 is an apocalyptic number.

1664078280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664078280 is an abundant number, since it is smaller than the sum of its proper divisors (3340166520).

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

1664078280 is a wasteful number, since it uses less digits than its factorization.

1664078280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33374 (or 33370 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 1664078280 is about 40793.1155956492. The cubic root of 1664078280 is about 1185.0170091383.

The spelling of 1664078280 in words is "one billion, six hundred sixty-four million, seventy-eight thousand, two hundred eighty".