201640730 has 32 divisors (see below), whose sum is σ = 384048000. Its totient is φ = 76012992.

The previous prime is 201640693. The next prime is 201640759. The reversal of 201640730 is 37046102.

It is a junction number, because it is equal to n+sod(n) for n = 201640696 and 201640705.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35144 + ... + 40476.

It is an arithmetic number, because the mean of its divisors is an integer number (12001500).

Almost surely, 2^201640730 is an apocalyptic number.

201640730 is a deficient number, since it is larger than the sum of its proper divisors (182407270).

201640730 is a wasteful number, since it uses less digits than its factorization.

201640730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5558.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 201640730 is about 14200.0257042021. The cubic root of 201640730 is about 586.3983689831.

Adding to 201640730 its reverse (37046102), we get a palindrome (238686832).

The spelling of 201640730 in words is "two hundred one million, six hundred forty thousand, seven hundred thirty".