1623681040 has 20 divisors (see below), whose sum is σ = 3775058604. Its totient is φ = 649472384.

The previous prime is 1623681019. The next prime is 1623681071. The reversal of 1623681040 is 401863261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1223040784 + 400640256 = 34972^2 + 20016^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1623680993 and 1623681011.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10147927 + ... + 10148086.

Almost surely, 2^1623681040 is an apocalyptic number.

1623681040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1623681040 is an abundant number, since it is smaller than the sum of its proper divisors (2151377564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1623681040 is a wasteful number, since it uses less digits than its factorization.

1623681040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20296026 (or 20296020 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1623681040 is about 40294.9257351344. The cubic root of 1623681040 is about 1175.3491740288.

The spelling of 1623681040 in words is "one billion, six hundred twenty-three million, six hundred eighty-one thousand, forty".