623993816 has 8 divisors (see below), whose sum is σ = 1169988420. Its totient is φ = 311996904.

The previous prime is 623993813. The next prime is 623993819. The reversal of 623993816 is 618399326.

It is an interprime number because it is at equal distance from previous prime (623993813) and next prime (623993819).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623993813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38999606 + ... + 38999621.

Almost surely, 2^623993816 is an apocalyptic number.

It is an amenable number.

623993816 is a deficient number, since it is larger than the sum of its proper divisors (545994604).

623993816 is a wasteful number, since it uses less digits than its factorization.

623993816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77999233 (or 77999229 counting only the distinct ones).

The product of its digits is 419904, while the sum is 47.

The square root of 623993816 is about 24979.8682142240. The cubic root of 623993816 is about 854.5289134541.

The spelling of 623993816 in words is "six hundred twenty-three million, nine hundred ninety-three thousand, eight hundred sixteen".