1645667274 has 32 divisors (see below), whose sum is σ = 3329415936. Its totient is φ = 542223360.

The previous prime is 1645667207. The next prime is 1645667293. The reversal of 1645667274 is 4727665461.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 715294 + ... + 717590.

It is an arithmetic number, because the mean of its divisors is an integer number (104044248).

Almost surely, 2^1645667274 is an apocalyptic number.

1645667274 is an abundant number, since it is smaller than the sum of its proper divisors (1683748662).

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

1645667274 is a wasteful number, since it uses less digits than its factorization.

1645667274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630.

The product of its digits is 1693440, while the sum is 48.

The square root of 1645667274 is about 40566.8247956381. The cubic root of 1645667274 is about 1180.6305339320.

The spelling of 1645667274 in words is "one billion, six hundred forty-five million, six hundred sixty-seven thousand, two hundred seventy-four".