1645867770 has 32 divisors (see below), whose sum is σ = 3958647552. Its totient is φ = 437946432.

The previous prime is 1645867747. The next prime is 1645867771. The reversal of 1645867770 is 777685461.

It is not an unprimeable number, because it can be changed into a prime (1645867771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45357 + ... + 73136.

It is an arithmetic number, because the mean of its divisors is an integer number (123707736).

Almost surely, 2^1645867770 is an apocalyptic number.

1645867770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645867770 is an abundant number, since it is smaller than the sum of its proper divisors (2312779782).

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

1645867770 is a wasteful number, since it uses less digits than its factorization.

1645867770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118966.

The product of its (nonzero) digits is 1975680, while the sum is 51.

The square root of 1645867770 is about 40569.2959021968. The cubic root of 1645867770 is about 1180.6784784327.

The spelling of 1645867770 in words is "one billion, six hundred forty-five million, eight hundred sixty-seven thousand, seven hundred seventy".