1640605026 has 48 divisors (see below), whose sum is σ = 3496852800. Its totient is φ = 513035520.

The previous prime is 1640604997. The next prime is 1640605039. The reversal of 1640605026 is 6205060461.

It is a junction number, because it is equal to n+sod(n) for n = 1640604984 and 1640605002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 603811 + ... + 606521.

It is an arithmetic number, because the mean of its divisors is an integer number (72851100).

Almost surely, 2^1640605026 is an apocalyptic number.

1640605026 is an abundant number, since it is smaller than the sum of its proper divisors (1856247774).

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

1640605026 is a wasteful number, since it uses less digits than its factorization.

1640605026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099 (or 3082 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1640605026 is about 40504.3827998897. The cubic root of 1640605026 is about 1179.4187087120.

Adding to 1640605026 its reverse (6205060461), we get a palindrome (7845665487).

The spelling of 1640605026 in words is "one billion, six hundred forty million, six hundred five thousand, twenty-six".