620633659 has 4 divisors (see below), whose sum is σ = 620683840. Its totient is φ = 620583480.

The previous prime is 620633647. The next prime is 620633677. The reversal of 620633659 is 956336026.

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, and also an emirpimes, since its reverse is a distinct semiprime: 956336026 = 2 ⋅478168013.

It is a cyclic number.

It is not a de Polignac number, because 620633659 - 2⁵ = 620633627 is a prime.

It is a super-2 number, since 2×620633659² = 770372277367456562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620633759) 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, 8077 + ... + 36145.

It is an arithmetic number, because the mean of its divisors is an integer number (155170960).

Almost surely, 2^620633659 is an apocalyptic number.

620633659 is a deficient number, since it is larger than the sum of its proper divisors (50181).

620633659 is a wasteful number, since it uses less digits than its factorization.

620633659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50180.

The product of its (nonzero) digits is 174960, while the sum is 40.

The square root of 620633659 is about 24912.5201254309. The cubic root of 620633659 is about 852.9922952429.

The spelling of 620633659 in words is "six hundred twenty million, six hundred thirty-three thousand, six hundred fifty-nine".