1640153636 has 12 divisors (see below), whose sum is σ = 3131202480. Its totient is φ = 745524360.

The previous prime is 1640153633. The next prime is 1640153651. The reversal of 1640153636 is 6363510461.

It is a junction number, because it is equal to n+sod(n) for n = 1640153596 and 1640153605.

It is not an unprimeable number, because it can be changed into a prime (1640153633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18638066 + ... + 18638153.

It is an arithmetic number, because the mean of its divisors is an integer number (260933540).

Almost surely, 2^1640153636 is an apocalyptic number.

It is an amenable number.

1640153636 is a deficient number, since it is larger than the sum of its proper divisors (1491048844).

1640153636 is a wasteful number, since it uses less digits than its factorization.

1640153636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37276234 (or 37276232 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 1640153636 is about 40498.8103035139. The cubic root of 1640153636 is about 1179.3105318229.

The spelling of 1640153636 in words is "one billion, six hundred forty million, one hundred fifty-three thousand, six hundred thirty-six".