158806638 has 12 divisors (see below), whose sum is σ = 344081088. Its totient is φ = 52935540.

The previous prime is 158806633. The next prime is 158806679. The reversal of 158806638 is 836608851.

158806638 is a `hidden beast` number, since 1 + 5 + 8 + 8 + 0 + 6 + 638 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 158806593 and 158806602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158806633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4411278 + ... + 4411313.

It is an arithmetic number, because the mean of its divisors is an integer number (28673424).

Almost surely, 2^158806638 is an apocalyptic number.

158806638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

158806638 is an abundant number, since it is smaller than the sum of its proper divisors (185274450).

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

158806638 is a wasteful number, since it uses less digits than its factorization.

158806638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8822599 (or 8822596 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 158806638 is about 12601.8505783873. The cubic root of 158806638 is about 541.5304525759.

The spelling of 158806638 in words is "one hundred fifty-eight million, eight hundred six thousand, six hundred thirty-eight".