620635428 has 36 divisors (see below), whose sum is σ = 1792947520. Its totient is φ = 177324336.

The previous prime is 620635387. The next prime is 620635441. The reversal of 620635428 is 824536026.

620635428 is a `hidden beast` number, since 620 + 6 + 3 + 5 + 4 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 620635392 and 620635401.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1231168 + ... + 1231671.

Almost surely, 2^620635428 is an apocalyptic number.

It is an amenable number.

620635428 is an abundant number, since it is smaller than the sum of its proper divisors (1172312092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620635428 is a wasteful number, since it uses less digits than its factorization.

620635428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462856 (or 2462851 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 620635428 is about 24912.5556296419. Note that the first 3 decimals coincide. The cubic root of 620635428 is about 852.9931056737.

The spelling of 620635428 in words is "six hundred twenty million, six hundred thirty-five thousand, four hundred twenty-eight".