1671561240 has 32 divisors (see below), whose sum is σ = 5014684080. Its totient is φ = 445749632.

The previous prime is 1671561239. The next prime is 1671561263. The reversal of 1671561240 is 421651761.

1671561240 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6964719 + ... + 6964958.

Almost surely, 2^1671561240 is an apocalyptic number.

1671561240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671561240 is an abundant number, since it is smaller than the sum of its proper divisors (3343122840).

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

1671561240 is a wasteful number, since it uses less digits than its factorization.

1671561240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13929691 (or 13929687 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1671561240 is about 40884.7311352294. The cubic root of 1671561240 is about 1186.7905988619.

The spelling of 1671561240 in words is "one billion, six hundred seventy-one million, five hundred sixty-one thousand, two hundred forty".