1645672006 has 32 divisors (see below), whose sum is σ = 2814248448. Its totient is φ = 715071840.

The previous prime is 1645672003. The next prime is 1645672043. The reversal of 1645672006 is 6002765461.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645672003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25956 + ... + 62968.

It is an arithmetic number, because the mean of its divisors is an integer number (87945264).

Almost surely, 2^1645672006 is an apocalyptic number.

1645672006 is a deficient number, since it is larger than the sum of its proper divisors (1168576442).

1645672006 is a wasteful number, since it uses less digits than its factorization.

1645672006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37116.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1645672006 is about 40566.8831191158. The cubic root of 1645672006 is about 1180.6316655375.

The spelling of 1645672006 in words is "one billion, six hundred forty-five million, six hundred seventy-two thousand, six".