621244657 has 8 divisors (see below), whose sum is σ = 678142080. Its totient is φ = 564417360.

The previous prime is 621244649. The next prime is 621244667. The reversal of 621244657 is 756442126.

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

It is a cyclic number.

It is not a de Polignac number, because 621244657 - 2³ = 621244649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621244667) 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, 1944 + ... + 35302.

It is an arithmetic number, because the mean of its divisors is an integer number (84767760).

Almost surely, 2^621244657 is an apocalyptic number.

It is an amenable number.

621244657 is a deficient number, since it is larger than the sum of its proper divisors (56897423).

621244657 is a wasteful number, since it uses less digits than its factorization.

621244657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35063.

The product of its digits is 80640, while the sum is 37.

The square root of 621244657 is about 24924.7799789687. The cubic root of 621244657 is about 853.2721198189.

The spelling of 621244657 in words is "six hundred twenty-one million, two hundred forty-four thousand, six hundred fifty-seven".