623975993 has 4 divisors (see below), whose sum is σ = 651105408. Its totient is φ = 596846580.

The previous prime is 623975987. The next prime is 623976013. The reversal of 623975993 is 399579326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399579326 = 2 ⋅199789663.

It is a cyclic number.

It is not a de Polignac number, because 623975993 - 2⁶ = 623975929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623975923) 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, 13564673 + ... + 13564718.

It is an arithmetic number, because the mean of its divisors is an integer number (162776352).

Almost surely, 2^623975993 is an apocalyptic number.

It is an amenable number.

623975993 is a deficient number, since it is larger than the sum of its proper divisors (27129415).

623975993 is a wasteful number, since it uses less digits than its factorization.

623975993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27129414.

The product of its digits is 2755620, while the sum is 53.

The square root of 623975993 is about 24979.5114643982. The cubic root of 623975993 is about 854.5207774686.

The spelling of 623975993 in words is "six hundred twenty-three million, nine hundred seventy-five thousand, nine hundred ninety-three".