626745641 has 4 divisors (see below), whose sum is σ = 626805972. Its totient is φ = 626685312.

The previous prime is 626745629. The next prime is 626745677. The reversal of 626745641 is 146547626.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 86415616 + 540330025 = 9296^2 + 23245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-626745641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (626745601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10160 + ... + 36833.

It is an arithmetic number, because the mean of its divisors is an integer number (156701493).

Almost surely, 2^626745641 is an apocalyptic number.

It is an amenable number.

626745641 is a deficient number, since it is larger than the sum of its proper divisors (60331).

626745641 is a wasteful number, since it uses less digits than its factorization.

626745641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60330.

The product of its digits is 241920, while the sum is 41.

The square root of 626745641 is about 25034.8884758850. Note that the first 3 decimals coincide. The cubic root of 626745641 is about 855.7832345014.

The spelling of 626745641 in words is "six hundred twenty-six million, seven hundred forty-five thousand, six hundred forty-one".