624778397 has 4 divisors (see below), whose sum is σ = 624882720. Its totient is φ = 624674076.

The previous prime is 624778393. The next prime is 624778403. The reversal of 624778397 is 793877426.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 793877426 = 2 ⋅396938713.

It is a cyclic number.

It is not a de Polignac number, because 624778397 - 2² = 624778393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624778393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42593 + ... + 55350.

It is an arithmetic number, because the mean of its divisors is an integer number (156220680).

Almost surely, 2^624778397 is an apocalyptic number.

It is an amenable number.

624778397 is a deficient number, since it is larger than the sum of its proper divisors (104323).

624778397 is an equidigital number, since it uses as much as digits as its factorization.

624778397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104322.

The product of its digits is 3556224, while the sum is 53.

The square root of 624778397 is about 24995.5675470672. The cubic root of 624778397 is about 854.8869118465.

The spelling of 624778397 in words is "six hundred twenty-four million, seven hundred seventy-eight thousand, three hundred ninety-seven".