1640170540 has 24 divisors (see below), whose sum is σ = 3646968192. Its totient is φ = 617475840.

The previous prime is 1640170531. The next prime is 1640170541. The reversal of 1640170540 is 450710461.

It is a junction number, because it is equal to n+sod(n) for n = 1640170499 and 1640170508.

It is not an unprimeable number, because it can be changed into a prime (1640170541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2411676 + ... + 2412355.

It is an arithmetic number, because the mean of its divisors is an integer number (151957008).

Almost surely, 2^1640170540 is an apocalyptic number.

1640170540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640170540 is an abundant number, since it is smaller than the sum of its proper divisors (2006797652).

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

1640170540 is a wasteful number, since it uses less digits than its factorization.

1640170540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4824057 (or 4824055 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1640170540 is about 40499.0190004647. The cubic root of 1640170540 is about 1179.3145832720.

The spelling of 1640170540 in words is "one billion, six hundred forty million, one hundred seventy thousand, five hundred forty".