1640162887 has 16 divisors (see below), whose sum is σ = 1813472640. Its totient is φ = 1471024800.

The previous prime is 1640162879. The next prime is 1640162891. The reversal of 1640162887 is 7882610461.

It is a cyclic number.

It is not a de Polignac number, because 1640162887 - 2³ = 1640162879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640162827) 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, 245937 + ... + 252517.

It is an arithmetic number, because the mean of its divisors is an integer number (113342040).

Almost surely, 2^1640162887 is an apocalyptic number.

1640162887 is a deficient number, since it is larger than the sum of its proper divisors (173309753).

1640162887 is a wasteful number, since it uses less digits than its factorization.

1640162887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6894.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 1640162887 is about 40498.9245165844. The cubic root of 1640162887 is about 1179.3127490504.

The spelling of 1640162887 in words is "one billion, six hundred forty million, one hundred sixty-two thousand, eight hundred eighty-seven".