1640007008 has 24 divisors (see below), whose sum is σ = 3230199000. Its totient is φ = 819639040.

The previous prime is 1640007001. The next prime is 1640007023. The reversal of 1640007008 is 8007000461.

It is a Cunningham number, because it is equal to 40497²-1.

It is a super-2 number, since 2×1640007008² = 5379245972578224128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640007001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70868 + ... + 91116.

It is an arithmetic number, because the mean of its divisors is an integer number (134591625).

Almost surely, 2^1640007008 is an apocalyptic number.

It is an amenable number.

1640007008 is a deficient number, since it is larger than the sum of its proper divisors (1590191992).

1640007008 is a wasteful number, since it uses less digits than its factorization.

1640007008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22790 (or 22782 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1640007008 is about 40496.9999876534. Note that the first 4 decimals coincide. The cubic root of 1640007008 is about 1179.2753877376.

Adding to 1640007008 its reverse (8007000461), we get a palindrome (9647007469).

The spelling of 1640007008 in words is "one billion, six hundred forty million, seven thousand, eight".