623920279 has 2 divisors, whose sum is σ = 623920280. Its totient is φ = 623920278.

The previous prime is 623920277. The next prime is 623920313. The reversal of 623920279 is 972029326.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 623920279 - 2¹ = 623920277 is a prime.

Together with 623920277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623920273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311960139 + 311960140.

It is an arithmetic number, because the mean of its divisors is an integer number (311960140).

Almost surely, 2^623920279 is an apocalyptic number.

623920279 is a deficient number, since it is larger than the sum of its proper divisors (1).

623920279 is an equidigital number, since it uses as much as digits as its factorization.

623920279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 623920279 is about 24978.3962455559. The cubic root of 623920279 is about 854.4953436975.

The spelling of 623920279 in words is "six hundred twenty-three million, nine hundred twenty thousand, two hundred seventy-nine".