158538644 has 12 divisors (see below), whose sum is σ = 302664768. Its totient is φ = 72063000.

The previous prime is 158538623. The next prime is 158538649. The reversal of 158538644 is 446835851.

158538644 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 3603151 = 158538644 / (1 + 5 + 8 + 5 + 3 + 8 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 158538595 and 158538604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158538649) 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, 1801532 + ... + 1801619.

It is an arithmetic number, because the mean of its divisors is an integer number (25222064).

Almost surely, 2^158538644 is an apocalyptic number.

It is an amenable number.

158538644 is a deficient number, since it is larger than the sum of its proper divisors (144126124).

158538644 is a wasteful number, since it uses less digits than its factorization.

158538644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603166 (or 3603164 counting only the distinct ones).

The product of its digits is 460800, while the sum is 44.

The square root of 158538644 is about 12591.2129677803. The cubic root of 158538644 is about 541.2256613178.

The spelling of 158538644 in words is "one hundred fifty-eight million, five hundred thirty-eight thousand, six hundred forty-four".