1640471206 has 32 divisors (see below), whose sum is σ = 2774992896. Its totient is φ = 721326600.

The previous prime is 1640471167. The next prime is 1640471263. The reversal of 1640471206 is 6021740461.

It is a super-2 number, since 2×1640471206² = 5382291555430188872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 654151 + ... + 656653.

It is an arithmetic number, because the mean of its divisors is an integer number (86718528).

Almost surely, 2^1640471206 is an apocalyptic number.

1640471206 is a deficient number, since it is larger than the sum of its proper divisors (1134521690).

1640471206 is an equidigital number, since it uses as much as digits as its factorization.

1640471206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 1640471206 is about 40502.7308462034. The cubic root of 1640471206 is about 1179.3866404404.

The spelling of 1640471206 in words is "one billion, six hundred forty million, four hundred seventy-one thousand, two hundred six".