623990805 has 16 divisors (see below), whose sum is σ = 1041793920. Its totient is φ = 318325568.

The previous prime is 623990791. The next prime is 623990819. The reversal of 623990805 is 508099326.

It is an interprime number because it is at equal distance from previous prime (623990791) and next prime (623990819).

It is a cyclic number.

It is not a de Polignac number, because 623990805 - 2¹² = 623986709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 903990 + ... + 904679.

It is an arithmetic number, because the mean of its divisors is an integer number (65112120).

Almost surely, 2^623990805 is an apocalyptic number.

It is an amenable number.

623990805 is a deficient number, since it is larger than the sum of its proper divisors (417803115).

623990805 is a wasteful number, since it uses less digits than its factorization.

623990805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808700.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 623990805 is about 24979.8079456188. The cubic root of 623990805 is about 854.5275389796.

The spelling of 623990805 in words is "six hundred twenty-three million, nine hundred ninety thousand, eight hundred five".