68138632 has 16 divisors (see below), whose sum is σ = 132165900. Its totient is φ = 32894400.

The previous prime is 68138593. The next prime is 68138633. The reversal of 68138632 is 23683186.

It can be written as a sum of positive squares in 2 ways, for example, as 63584676 + 4553956 = 7974^2 + 2134^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68138591 and 68138600.

It is not an unprimeable number, because it can be changed into a prime (68138633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146619 + ... + 147082.

Almost surely, 2^68138632 is an apocalyptic number.

It is an amenable number.

68138632 is a deficient number, since it is larger than the sum of its proper divisors (64027268).

68138632 is a wasteful number, since it uses less digits than its factorization.

68138632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293736 (or 293732 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 68138632 is about 8254.6127710511. The cubic root of 68138632 is about 408.4426983841.

The spelling of 68138632 in words is "sixty-eight million, one hundred thirty-eight thousand, six hundred thirty-two".