623981995 has 16 divisors (see below), whose sum is σ = 921574080. Its totient is φ = 394959744.

The previous prime is 623981959. The next prime is 623981999. The reversal of 623981995 is 599189326.

623981995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 623981995 - 2⁹ = 623981483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (623981999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685240 + ... + 686149.

It is an arithmetic number, because the mean of its divisors is an integer number (57598380).

Almost surely, 2^623981995 is an apocalyptic number.

623981995 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

623981995 is a deficient number, since it is larger than the sum of its proper divisors (297592085).

623981995 is a wasteful number, since it uses less digits than its factorization.

623981995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371414.

The product of its digits is 1049760, while the sum is 52.

The square root of 623981995 is about 24979.6316025677. The cubic root of 623981995 is about 854.5235173268.

The spelling of 623981995 in words is "six hundred twenty-three million, nine hundred eighty-one thousand, nine hundred ninety-five".