1640854770 has 32 divisors (see below), whose sum is σ = 3953759040. Its totient is φ = 435816000.

The previous prime is 1640854711. The next prime is 1640854777. The reversal of 1640854770 is 774580461.

It is not an unprimeable number, because it can be changed into a prime (1640854777) 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, 101425 + ... + 116484.

It is an arithmetic number, because the mean of its divisors is an integer number (123554970).

Almost surely, 2^1640854770 is an apocalyptic number.

1640854770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640854770 is an abundant number, since it is smaller than the sum of its proper divisors (2312904270).

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

1640854770 is a wasteful number, since it uses less digits than its factorization.

1640854770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218170.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 1640854770 is about 40507.4656082061. The cubic root of 1640854770 is about 1179.4785520415.

The spelling of 1640854770 in words is "one billion, six hundred forty million, eight hundred fifty-four thousand, seven hundred seventy".