623428647 has 8 divisors (see below), whose sum is σ = 831363456. Its totient is φ = 415556472.

The previous prime is 623428643. The next prime is 623428679. The reversal of 623428647 is 746824326.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 623428647 - 2² = 623428643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 623428599 and 623428608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623428643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17758 + ... + 39524.

It is an arithmetic number, because the mean of its divisors is an integer number (103920432).

Almost surely, 2^623428647 is an apocalyptic number.

623428647 is a deficient number, since it is larger than the sum of its proper divisors (207934809).

623428647 is a wasteful number, since it uses less digits than its factorization.

623428647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31317.

The product of its digits is 387072, while the sum is 42.

The square root of 623428647 is about 24968.5531619275. The cubic root of 623428647 is about 854.2708451203.

The spelling of 623428647 in words is "six hundred twenty-three million, four hundred twenty-eight thousand, six hundred forty-seven".