620163621 has 80 divisors (see below), whose sum is σ = 1223164800. Its totient is φ = 303160320.

The previous prime is 620163617. The next prime is 620163641. The reversal of 620163621 is 126361026.

620163621 is a `hidden beast` number, since 6 + 2 + 0 + 1 + 636 + 21 = 666.

It is not a de Polignac number, because 620163621 - 2² = 620163617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620163611) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 103105 + ... + 108953.

It is an arithmetic number, because the mean of its divisors is an integer number (15289560).

Almost surely, 2^620163621 is an apocalyptic number.

It is an amenable number.

620163621 is a deficient number, since it is larger than the sum of its proper divisors (603001179).

620163621 is a wasteful number, since it uses less digits than its factorization.

620163621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896 (or 5887 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 620163621 is about 24903.0845679807. The cubic root of 620163621 is about 852.7769024495.

The spelling of 620163621 in words is "six hundred twenty million, one hundred sixty-three thousand, six hundred twenty-one".