623889864 has 192 divisors, whose sum is σ = 1908763200. Its totient is φ = 191056320.

The previous prime is 623889857. The next prime is 623889923. The reversal of 623889864 is 468988326.

623889864 is a `hidden beast` number, since 623 + 8 + 8 + 9 + 8 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 623889864.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2956719 + ... + 2956929.

It is an arithmetic number, because the mean of its divisors is an integer number (9941475).

Almost surely, 2^623889864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623889864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (954381600).

623889864 is an abundant number, since it is smaller than the sum of its proper divisors (1284873336).

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

623889864 is a wasteful number, since it uses less digits than its factorization.

623889864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 229 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 623889864 is about 24977.7874120187. The cubic root of 623889864 is about 854.4814584310.

The spelling of 623889864 in words is "six hundred twenty-three million, eight hundred eighty-nine thousand, eight hundred sixty-four".