1640162890 has 64 divisors (see below), whose sum is σ = 3272016384. Its totient is φ = 588791808.

The previous prime is 1640162879. The next prime is 1640162891. The reversal of 1640162890 is 982610461.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1640162891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2255707 + ... + 2256433.

It is an arithmetic number, because the mean of its divisors is an integer number (51125256).

Almost surely, 2^1640162890 is an apocalyptic number.

1640162890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640162890 is a deficient number, since it is larger than the sum of its proper divisors (1631853494).

1640162890 is a wasteful number, since it uses less digits than its factorization.

1640162890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1640162890 is about 40498.9245536224. The cubic root of 1640162890 is about 1179.3127497695.

The spelling of 1640162890 in words is "one billion, six hundred forty million, one hundred sixty-two thousand, eight hundred ninety".