624649 has 2 divisors, whose sum is σ = 624650. Its totient is φ = 624648.

The previous prime is 624643. The next prime is 624667. The reversal of 624649 is 946426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 480249 + 144400 = 693^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 624649 - 2⁷ = 624521 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 624649.

It is not a weakly prime, because it can be changed into another prime (624643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312324 + 312325.

It is an arithmetic number, because the mean of its divisors is an integer number (312325).

2⁶²⁴⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

624649 is a deficient number, since it is larger than the sum of its proper divisors (1).

624649 is an equidigital number, since it uses as much as digits as its factorization.

624649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 624649 is about 790.3473919739. The cubic root of 624649 is about 85.4827889618.

The spelling of 624649 in words is "six hundred twenty-four thousand, six hundred forty-nine".