1660047400 has 72 divisors (see below), whose sum is σ = 4242443310. Its totient is φ = 603644800.

The previous prime is 1660047391. The next prime is 1660047407. The reversal of 1660047400 is 47400661.

It can be written as a sum of positive squares in 3 ways, for example, as 878173956 + 781873444 = 29634^2 + 27962^2 .

It is not an unprimeable number, because it can be changed into a prime (1660047407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10099 + ... + 58498.

Almost surely, 2^1660047400 is an apocalyptic number.

1660047400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660047400 is an abundant number, since it is smaller than the sum of its proper divisors (2582395910).

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

1660047400 is a wasteful number, since it uses less digits than its factorization.

1660047400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68635 (or 68615 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1660047400 is about 40743.6792643963. The cubic root of 1660047400 is about 1184.0594172915.

It can be divided in two parts, 16600 and 47400, that added together give a cube (64000 = 40³).

The spelling of 1660047400 in words is "one billion, six hundred sixty million, forty-seven thousand, four hundred".