1620662401 has 8 divisors (see below), whose sum is σ = 1644594624. Its totient is φ = 1596761040.

The previous prime is 1620662387. The next prime is 1620662447. The reversal of 1620662401 is 1042660261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620662401 - 2⁵ = 1620662369 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 1620662401.

It is not an unprimeable number, because it can be changed into a prime (1620612401) 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 7 ways as a sum of consecutive naturals, for example, 111511 + ... + 125203.

It is an arithmetic number, because the mean of its divisors is an integer number (205574328).

Almost surely, 2^1620662401 is an apocalyptic number.

It is an amenable number.

1620662401 is a deficient number, since it is larger than the sum of its proper divisors (23932223).

1620662401 is a wasteful number, since it uses less digits than its factorization.

1620662401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15431.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1620662401 is about 40257.4514965863. The cubic root of 1620662401 is about 1174.6203453676.

The spelling of 1620662401 in words is "one billion, six hundred twenty million, six hundred sixty-two thousand, four hundred one".