630290988 has 72 divisors (see below), whose sum is σ = 1719900000. Its totient is φ = 194025216.

The previous prime is 630290981. The next prime is 630291001. The reversal of 630290988 is 889092036.

630290988 is a `hidden beast` number, since 630 + 2 + 9 + 0 + 9 + 8 + 8 = 666.

It is a super-2 number, since 2×630290988² = 794533459108032288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (630290981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10888 + ... + 37136.

It is an arithmetic number, because the mean of its divisors is an integer number (23887500).

Almost surely, 2^630290988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 630290988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (859950000).

630290988 is an abundant number, since it is smaller than the sum of its proper divisors (1089609012).

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

630290988 is a wasteful number, since it uses less digits than its factorization.

630290988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26311 (or 26306 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 630290988 is about 25105.5967465424. The cubic root of 630290988 is about 857.3938535890.

The spelling of 630290988 in words is "six hundred thirty million, two hundred ninety thousand, nine hundred eighty-eight".