621633042 has 20 divisors (see below), whose sum is σ = 1392918846. Its totient is φ = 207210960.

The previous prime is 621633037. The next prime is 621633043. The reversal of 621633042 is 240336126.

621633042 is a `hidden beast` number, since 6 + 21 + 633 + 0 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 547138881 + 74494161 = 23391^2 + 8631^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 621632997 and 621633015.

It is not an unprimeable number, because it can be changed into a prime (621633043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1918459 + ... + 1918782.

Almost surely, 2^621633042 is an apocalyptic number.

621633042 is an abundant number, since it is smaller than the sum of its proper divisors (771285804).

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

621633042 is a wasteful number, since it uses less digits than its factorization.

621633042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3837255 (or 3837246 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 621633042 is about 24932.5699036421. The cubic root of 621633042 is about 853.4498968306.

Adding to 621633042 its reverse (240336126), we get a palindrome (861969168).

The spelling of 621633042 in words is "six hundred twenty-one million, six hundred thirty-three thousand, forty-two".