1620400675 has 12 divisors (see below), whose sum is σ = 2010217816. Its totient is φ = 1295726400.

The previous prime is 1620400673. The next prime is 1620400699. The reversal of 1620400675 is 5760040261.

It is a happy number.

It is not a de Polignac number, because 1620400675 - 2¹ = 1620400673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620400673) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 45607 + ... + 72943.

Almost surely, 2^1620400675 is an apocalyptic number.

1620400675 is a deficient number, since it is larger than the sum of its proper divisors (389817141).

1620400675 is a wasteful number, since it uses less digits than its factorization.

1620400675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29718 (or 29713 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1620400675 is about 40254.2007124722. The cubic root of 1620400675 is about 1174.5571108871.

The spelling of 1620400675 in words is "one billion, six hundred twenty million, four hundred thousand, six hundred seventy-five".