629880138 has 20 divisors (see below), whose sum is σ = 1411398450. Its totient is φ = 209959992.

The previous prime is 629880133. The next prime is 629880161. The reversal of 629880138 is 831088926.

629880138 is a `hidden beast` number, since 629 + 8 + 8 + 0 + 13 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 618367689 + 11512449 = 24867^2 + 3393^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 629880093 and 629880102.

It is not an unprimeable number, because it can be changed into a prime (629880131) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1943913 + ... + 1944236.

Almost surely, 2^629880138 is an apocalyptic number.

629880138 is an abundant number, since it is smaller than the sum of its proper divisors (781518312).

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

629880138 is a wasteful number, since it uses less digits than its factorization.

629880138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888163 (or 3888154 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 629880138 is about 25097.4129742490. The cubic root of 629880138 is about 857.2075180506.

It can be divided in two parts, 6298 and 80138, that added together give a square (86436 = 294²).

The spelling of 629880138 in words is "six hundred twenty-nine million, eight hundred eighty thousand, one hundred thirty-eight".