1645168290 has 32 divisors (see below), whose sum is σ = 3950182080. Its totient is φ = 438513984.

The previous prime is 1645168279. The next prime is 1645168309. The reversal of 1645168290 is 928615461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62896 + ... + 85124.

It is an arithmetic number, because the mean of its divisors is an integer number (123443190).

Almost surely, 2^1645168290 is an apocalyptic number.

1645168290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645168290 is an abundant number, since it is smaller than the sum of its proper divisors (2305013790).

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

1645168290 is a wasteful number, since it uses less digits than its factorization.

1645168290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24706.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1645168290 is about 40560.6741807875. The cubic root of 1645168290 is about 1180.5111952484.

The spelling of 1645168290 in words is "one billion, six hundred forty-five million, one hundred sixty-eight thousand, two hundred ninety".