1640622775 has 24 divisors (see below), whose sum is σ = 2315816064. Its totient is φ = 1141298400.

The previous prime is 1640622691. The next prime is 1640622787. The reversal of 1640622775 is 5772260461.

It is not a de Polignac number, because 1640622775 - 2¹¹ = 1640620727 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 123369 + ... + 136018.

It is an arithmetic number, because the mean of its divisors is an integer number (96492336).

Almost surely, 2^1640622775 is an apocalyptic number.

1640622775 is a deficient number, since it is larger than the sum of its proper divisors (675193289).

1640622775 is a wasteful number, since it uses less digits than its factorization.

1640622775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259431 (or 259426 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 1640622775 is about 40504.6018990435. The cubic root of 1640622775 is about 1179.4229619046.

The spelling of 1640622775 in words is "one billion, six hundred forty million, six hundred twenty-two thousand, seven hundred seventy-five".