1623415681 has 8 divisors (see below), whose sum is σ = 1628640000. Its totient is φ = 1618200480.

The previous prime is 1623415669. The next prime is 1623415699. The reversal of 1623415681 is 1865143261.

It is a happy number.

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 1623415681 - 2⁷ = 1623415553 is a prime.

It is a super-2 number, since 2×1623415681² = 5270956946633387522, 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 1623415681.

It is not an unprimeable number, because it can be changed into a prime (1623475681) 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 7 ways as a sum of consecutive naturals, for example, 539820 + ... + 542818.

It is an arithmetic number, because the mean of its divisors is an integer number (203580000).

Almost surely, 2^1623415681 is an apocalyptic number.

It is an amenable number.

1623415681 is a deficient number, since it is larger than the sum of its proper divisors (5224319).

1623415681 is a wasteful number, since it uses less digits than its factorization.

1623415681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4559.

The product of its digits is 34560, while the sum is 37.

The square root of 1623415681 is about 40291.6328907132. The cubic root of 1623415681 is about 1175.2851412403.

The spelling of 1623415681 in words is "one billion, six hundred twenty-three million, four hundred fifteen thousand, six hundred eighty-one".