1640173634 has 24 divisors (see below), whose sum is σ = 2863334124. Its totient is φ = 701676800.

The previous prime is 1640173621. The next prime is 1640173649. The reversal of 1640173634 is 4363710461.

It can be written as a sum of positive squares in 2 ways, for example, as 1588261609 + 51912025 = 39853^2 + 7205^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1640173594 and 1640173603.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195227 + ... + 203454.

Almost surely, 2^1640173634 is an apocalyptic number.

1640173634 is a deficient number, since it is larger than the sum of its proper divisors (1223160490).

1640173634 is a wasteful number, since it uses less digits than its factorization.

1640173634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398722 (or 398711 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 1640173634 is about 40499.0571989028. The cubic root of 1640173634 is about 1179.3153248203.

The spelling of 1640173634 in words is "one billion, six hundred forty million, one hundred seventy-three thousand, six hundred thirty-four".