623553642 has 24 divisors (see below), whose sum is σ = 1430506116. Its totient is φ = 195624576.

The previous prime is 623553631. The next prime is 623553649. The reversal of 623553642 is 246355326.

623553642 is a `hidden beast` number, since 6 + 2 + 3 + 5 + 5 + 3 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 598242681 + 25310961 = 24459^2 + 5031^2 .

It is a junction number, because it is equal to n+sod(n) for n = 623553597 and 623553606.

It is not an unprimeable number, because it can be changed into a prime (623553649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1018573 + ... + 1019184.

Almost surely, 2^623553642 is an apocalyptic number.

623553642 is an abundant number, since it is smaller than the sum of its proper divisors (806952474).

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

623553642 is a wasteful number, since it uses less digits than its factorization.

623553642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037782 (or 2037779 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 623553642 is about 24971.0560849957. The cubic root of 623553642 is about 854.3279339571.

The spelling of 623553642 in words is "six hundred twenty-three million, five hundred fifty-three thousand, six hundred forty-two".