623641547 has 4 divisors (see below), whose sum is σ = 623712216. Its totient is φ = 623570880.

The previous prime is 623641519. The next prime is 623641559. The reversal of 623641547 is 745146326.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 745146326 = 2 ⋅372573163.

It is a cyclic number.

It is not a de Polignac number, because 623641547 - 2⁶ = 623641483 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 623641547.

It is not an unprimeable number, because it can be changed into a prime (623641567) 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 3 ways as a sum of consecutive naturals, for example, 19829 + ... + 40502.

It is an arithmetic number, because the mean of its divisors is an integer number (155928054).

Almost surely, 2^623641547 is an apocalyptic number.

623641547 is a deficient number, since it is larger than the sum of its proper divisors (70669).

623641547 is a wasteful number, since it uses less digits than its factorization.

623641547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70668.

The product of its digits is 120960, while the sum is 38.

The square root of 623641547 is about 24972.8161607777. The cubic root of 623641547 is about 854.3680781474.

The spelling of 623641547 in words is "six hundred twenty-three million, six hundred forty-one thousand, five hundred forty-seven".