1620363623 has 4 divisors (see below), whose sum is σ = 1621484880. Its totient is φ = 1619242368.

The previous prime is 1620363601. The next prime is 1620363649. The reversal of 1620363623 is 3263630261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3263630261 = 251 ⋅13002511.

It is a cyclic number.

It is not a de Polignac number, because 1620363623 - 2¹² = 1620359527 is a prime.

It is a super-2 number, since 2×1620363623² = 5251156541483372258, which contains 22 as substring.

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 1620363623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620363673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558458 + ... + 561351.

It is an arithmetic number, because the mean of its divisors is an integer number (405371220).

Almost surely, 2^1620363623 is an apocalyptic number.

1620363623 is a deficient number, since it is larger than the sum of its proper divisors (1121257).

1620363623 is a wasteful number, since it uses less digits than its factorization.

1620363623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121256.

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 1620363623 is about 40253.7404845811. The cubic root of 1620363623 is about 1174.5481583643.

Adding to 1620363623 its reverse (3263630261), we get a palindrome (4883993884).

The spelling of 1620363623 in words is "one billion, six hundred twenty million, three hundred sixty-three thousand, six hundred twenty-three".