1625620605 has 32 divisors (see below), whose sum is σ = 2975367168. Its totient is φ = 742440000.

The previous prime is 1625620589. The next prime is 1625620627. The reversal of 1625620605 is 5060265261.

It is a happy number.

It is not a de Polignac number, because 1625620605 - 2⁴ = 1625620589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114130 + ... + 127580.

It is an arithmetic number, because the mean of its divisors is an integer number (92980224).

Almost surely, 2^1625620605 is an apocalyptic number.

1625620605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1625620605 is a deficient number, since it is larger than the sum of its proper divisors (1349746563).

1625620605 is a wasteful number, since it uses less digits than its factorization.

1625620605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14617.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1625620605 is about 40318.9856643244. The cubic root of 1625620605 is about 1175.8169914845.

Adding to 1625620605 its reverse (5060265261), we get a palindrome (6685885866).

The spelling of 1625620605 in words is "one billion, six hundred twenty-five million, six hundred twenty thousand, six hundred five".