1620540633 has 8 divisors (see below), whose sum is σ = 2162639200. Its totient is φ = 1079401248.

The previous prime is 1620540629. The next prime is 1620540637. The reversal of 1620540633 is 3360450261.

It is an interprime number because it is at equal distance from previous prime (1620540629) and next prime (1620540637).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620540633 - 2² = 1620540629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620540633.

It is not an unprimeable number, because it can be changed into a prime (1620540637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235843 + ... + 242616.

It is an arithmetic number, because the mean of its divisors is an integer number (270329900).

Almost surely, 2^1620540633 is an apocalyptic number.

It is an amenable number.

1620540633 is a deficient number, since it is larger than the sum of its proper divisors (542098567).

1620540633 is a wasteful number, since it uses less digits than its factorization.

1620540633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479591.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 1620540633 is about 40255.9391021996. The cubic root of 1620540633 is about 1174.5909263777.

Adding to 1620540633 its reverse (3360450261), we get a palindrome (4980990894).

The spelling of 1620540633 in words is "one billion, six hundred twenty million, five hundred forty thousand, six hundred thirty-three".