630422781 has 16 divisors (see below), whose sum is σ = 892584000. Its totient is φ = 394414848.

The previous prime is 630422777. The next prime is 630422783. The reversal of 630422781 is 187224036.

It is not a de Polignac number, because 630422781 - 2² = 630422777 is a prime.

It is a super-2 number, since 2×630422781² = 794865765607547922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630422783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90 + ... + 35508.

It is an arithmetic number, because the mean of its divisors is an integer number (55786500).

Almost surely, 2^630422781 is an apocalyptic number.

It is an amenable number.

630422781 is a deficient number, since it is larger than the sum of its proper divisors (262161219).

630422781 is a wasteful number, since it uses less digits than its factorization.

630422781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35788.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 630422781 is about 25108.2213826468. The cubic root of 630422781 is about 857.4536093924.

The spelling of 630422781 in words is "six hundred thirty million, four hundred twenty-two thousand, seven hundred eighty-one".