626645497 has 8 divisors (see below), whose sum is σ = 637326272. Its totient is φ = 615978000.

The previous prime is 626645473. The next prime is 626645519. The reversal of 626645497 is 794546626.

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

It is a de Polignac number, because none of the positive numbers 2^k-626645497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 626645497.

It is not an unprimeable number, because it can be changed into a prime (626643497) 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, 153598 + ... + 157624.

It is an arithmetic number, because the mean of its divisors is an integer number (79665784).

Almost surely, 2^626645497 is an apocalyptic number.

It is an amenable number.

626645497 is a deficient number, since it is larger than the sum of its proper divisors (10680775).

626645497 is a wasteful number, since it uses less digits than its factorization.

626645497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6639.

The product of its digits is 2177280, while the sum is 49.

The square root of 626645497 is about 25032.8883071850. Note that the first 3 decimals coincide. The cubic root of 626645497 is about 855.7376518835.

The spelling of 626645497 in words is "six hundred twenty-six million, six hundred forty-five thousand, four hundred ninety-seven".