623994977 has 2 divisors, whose sum is σ = 623994978. Its totient is φ = 623994976.

The previous prime is 623994901. The next prime is 623994989. The reversal of 623994977 is 779499326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321269776 + 302725201 = 17924^2 + 17399^2 .

It is a cyclic number.

It is not a de Polignac number, because 623994977 - 2²⁴ = 607217761 is a prime.

It is not a weakly prime, because it can be changed into another prime (623994277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311997488 + 311997489.

It is an arithmetic number, because the mean of its divisors is an integer number (311997489).

Almost surely, 2^623994977 is an apocalyptic number.

It is an amenable number.

623994977 is a deficient number, since it is larger than the sum of its proper divisors (1).

623994977 is an equidigital number, since it uses as much as digits as its factorization.

623994977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 56.

The square root of 623994977 is about 24979.8914529267. The cubic root of 623994977 is about 854.5294434312.

It can be divided in two parts, 62399 and 4977, that added together give a palindrome (67376).

The spelling of 623994977 in words is "six hundred twenty-three million, nine hundred ninety-four thousand, nine hundred seventy-seven".