623419987 has 4 divisors (see below), whose sum is σ = 623501280. Its totient is φ = 623338696.

The previous prime is 623419969. The next prime is 623419999. The reversal of 623419987 is 789914326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 623419987 - 2¹¹ = 623417939 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 623419987.

It is not an unprimeable number, because it can be changed into a prime (623419187) 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, 27787 + ... + 44932.

It is an arithmetic number, because the mean of its divisors is an integer number (155875320).

Almost surely, 2^623419987 is an apocalyptic number.

623419987 is a deficient number, since it is larger than the sum of its proper divisors (81293).

623419987 is an equidigital number, since it uses as much as digits as its factorization.

623419987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81292.

The product of its digits is 653184, while the sum is 49.

The square root of 623419987 is about 24968.3797431872. The cubic root of 623419987 is about 854.2668895648.

The spelling of 623419987 in words is "six hundred twenty-three million, four hundred nineteen thousand, nine hundred eighty-seven".