158428821 has 24 divisors (see below), whose sum is σ = 224235264. Its totient is φ = 99480960.

The previous prime is 158428799. The next prime is 158428843. The reversal of 158428821 is 128824851.

It is an interprime number because it is at equal distance from previous prime (158428799) and next prime (158428843).

It is not a de Polignac number, because 158428821 - 2¹⁴ = 158412437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 158428821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158428861) 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, 260700 + ... + 261306.

It is an arithmetic number, because the mean of its divisors is an integer number (9343136).

Almost surely, 2^158428821 is an apocalyptic number.

It is an amenable number.

158428821 is a deficient number, since it is larger than the sum of its proper divisors (65806443).

158428821 is a wasteful number, since it uses less digits than its factorization.

158428821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 870 counting only the distinct ones).

The product of its digits is 40960, while the sum is 39.

The square root of 158428821 is about 12586.8511153505. The cubic root of 158428821 is about 541.1006597104.

The spelling of 158428821 in words is "one hundred fifty-eight million, four hundred twenty-eight thousand, eight hundred twenty-one".