620434661 has 16 divisors (see below), whose sum is σ = 774766080. Its totient is φ = 482682480.

The previous prime is 620434657. The next prime is 620434663. The reversal of 620434661 is 166434026.

It is not a de Polignac number, because 620434661 - 2² = 620434657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620434663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44630 + ... + 56856.

It is an arithmetic number, because the mean of its divisors is an integer number (48422880).

Almost surely, 2^620434661 is an apocalyptic number.

It is an amenable number.

620434661 is a deficient number, since it is larger than the sum of its proper divisors (154331419).

620434661 is a wasteful number, since it uses less digits than its factorization.

620434661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12904.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 620434661 is about 24908.5258696696. The cubic root of 620434661 is about 852.9011185862.

Adding to 620434661 its reverse (166434026), we get a palindrome (786868687).

The spelling of 620434661 in words is "six hundred twenty million, four hundred thirty-four thousand, six hundred sixty-one".